Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 1-3 show a frontal system approaching the Pacific Northwest Sunday. An Upper Level Low Pressure Trough (Shaded “U”shape with blue arrows) will help change our weather pattern for next week. The graphics for days 3-7 show a frontal system approaching and then moving through  Oregon late next week.

Note: The Perseid Meteor Shower peaks this weekend from tonight through Sunday night. The moon will be about three quarters full so that will make viewing more difficult. Here cloud cover could be a problem as well as any residual smokey haze. Best viewing time will be after midnight tonight, Saturday and Sunday. Get away from the city lights and the sky won’t have the glow of city lights to obstruct your view.

 

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 64 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 67 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 49 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING AND OUTFLOW WINDS UNTIL 10 PM TONIGHT FOR THE EAST SLOPES OF THE CENTRAL OREGON CASCADES, THE CENTRAL MOUNTAINS OF OREGON, THE SOUTHERN BLUE AND STRAWBERRY MOUNTAINS OF OREGON, AND FOR THE CENTRAL BLUE MOUNTAINS OF OREGON.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING AND OUTFLOW WINDS FROM NOON UNTIL 11 PM SATURDAY THE CENTRAL MOUNTAINS OF OREGON, THE SOUTHERN BLUE AND STRAWBERRY MOUNTAINS OF OREGON, AND FOR THE CENTRAL BLUE MOUNTAINS OF OREGON.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 10 PM TONIGHT FOR THE DESCHUTES NATIONAL FOREST AND THE MINUS SISTERS RANGER DISTRICT.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 2 PM THIS AFTERNOON UNTIL 11 PM TONIGHT FOR THE UMPQUA NATIONAL FOREST, AND THE SOUTHERN OREGON CASCADES.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 2 PM UNTIL 11 PM SATURDAY FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE UMPQUA NATIONAL FOREST, AND THE SOUTHERN OREGON CASCADES.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 AM SATURDAY FOR CROOK COUNTY, DESCHUTES COUNTY, GRANT COUNTY, WHEELER COUNTY, WASCO, JEFFERSON COUNTY, GILLAM COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, AND WALLOWA COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake, to include Shoalwater Bay to the north. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued Health Advisory for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy this evening, mostly cloudy late tonight and Saturday AM, a mix of clouds and sun in the afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late Saturday night,
• Cloudy with a slight (20%) chance of AM showers (0.10 in. of rain possible), just cloudy and a bit cooler Sunday afternoon, partly cloudy at night,
• Then partly cloudy and a bit warmer Monday and Monday night.
• lows 57-52 highs 82-77 warming back to 82 Monday.
• Partly cloudy in the AM, mostly sunny and a bit warmer Tuesday afternoon, partly cloudy at night,
• Partly cloudy and a bit warmer Wednesday through Thursday AM, mostly sunny in the afternoon, partly cloudy Thursday night,
• Partly cloudy Friday AM, then mostly sunny and a bit warmer in the afternoon.
• highs 80-88 lows 52-55. (seasonal averages high 83 low 52)

 

________________

Eugene-Springfield Pollen Count

Grass………. Low (2)
Trees………. Low (3)
Last Counted: 8/10/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke tonight and a slight (20%) chance of isolated thunderstorms this evening, partly cloudy with patchy smoke late tonight,
• AM clouds and smoke, sunny and a bit cooler with patchy smoke Saturday afternoon, mostly clear with patchy evening smoke, partly cloudy with a slight (20%) chance of late Saturday night,
• A slight (20%) chance of AM showers, mostly cloudy and a bit cooler Sunday afternoon and evening, partly cloudy late Sunday night,
• Partly cloudy Monday and Monday night.
• lows 59-54 highs 85-83.
• Partly cloudy and a bit warmer Tuesday mostly clear at night,
• Mostly sunny and a bit warmer Wednesday, Thursday, and Friday mostly clear at night.
• highs 85-92 lows 54-60. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy with patchy fog late tonight and Saturday AM, partly cloudy with patchy fog in the afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late Saturday night,
• Mostly cloudy with a slight (20%) chance of AM showers, mostly cloudy Sunday afternoon, mostly cloudy in the evening, partly cloudy late at night,
• Then partly cloudy Monday and Monday night.
• lows 55-53 highs near 64.
• Partly cloudy in the AM, sunny Tuesday afternoon, mostly clear Tuesday night,
• Mostly sunny Wednesday, partly cloudy Wednesday night through Friday AM, then mostly sunny in the afternoon.
• highs near 65 lows near 55. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy with areas of smoke and a (30%) chance of showers and thunderstorms this evening, partly cloudy with patchy smoke and a slight (20%) chance of showers and thunderstorms late tonight,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday, just partly cloudy at night,
• Mostly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler Sunday afternoon, just partly cloudy late Sunday night,
• Then partly cloudy and a bit warmer Monday and Monday night.
• snow level above 8,000 ft. tonight through Sunday, free air freezing level above 12,000 ft. Sunday night through Monday night.
• lows 54-46 highs 74-65 warming to 68 Monday.
• Partly cloudy Tuesday AM, mostly sunny and a bit warmer in the afternoon, partly cloudy Tuesday night,
• Mostly sunny and a bit warmer Wednesday through Friday.
• free air freezing level above 12,000 ft. Tuesday through Friday,
• highs 68-75 lows 45-47.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 1-3 show a frontal system approaching the Pacific Northwest Sunday. An Upper Level Low Pressure Trough (Shaded “U”shape with blue arrows) will help change our weather pattern for next week. The graphics for days 3-7 show a frontal system approaching and then moving through  Oregon late next week.

Note: The Perseid Meteor Shower peaks this weekend from tonight through Sunday. The moon will be about three quarters full so that will make viewing more difficult. Here cloud cover could be a problem as well as any residual smokey haze. Best viewing time will be after midnight tonight, Saturday and Sunday. Get away from the city lights and the sky won’t have the glow of city lights to obstruct your view.

 

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 55 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 65 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 44 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING UNTIL 10 PM TONIGHT FOR THE EAST SLOPES OF THE CENTRAL OREGON CASCADES, THE CENTRAL MOUNTAINS OF OREGON, THE SOUTHERN BLUE AND STRAWBERRY MOUNTAINS OF OREGON, AND FOR THE CENTRAL BLUE MOUNTAINS OF OREGON.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 10 PM TONIGHT FOR THE DESCHUTES NATIONAL FOREST AND THE MINUS SISTERS RANGER DISTRICT.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 2 PM THIS AFTERNOON UNTIL 11 PM TONIGHT FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE UMPQUA NATIONAL FOREST, AND THE SOUTHERN OREGON CASCADES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM TONIGHT FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON TODAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 PM TONIGHT FOR JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 AM SATURDAY FOR CROOK COUNTY, DESCHUTES COUNTY, GRANT COUNTY, WHEELER COUNTY, WASCO, JEFFERSON COUNTY, GILLAM COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, AND WALLOWA COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake, to include Shoalwater Bay to the north. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued Health Advisory for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy and a bit cooler with patchy smoke this afternoon and tonight,
• Mostly cloudy Saturday AM, partly cloudy and a bit cooler in the afternoon, mostly cloudy with a slight (20%) chance of rain late Saturday night and Sunday AM, mostly cloudy in the afternoon and evening, just partly cloudy late Sunday night.
• highs 85-78 lows 56-54.
• Partly cloudy and a bit warmer Monday through Wednesday night,
• AM sun then partly cloudy Thursday afternoon.
• highs 80-87 lows near 52. (seasonal averages high 84 low 52)

 

________________

Eugene-Springfield Pollen Count

Grass………. Low (2)
Trees………. Low (3)
Last Counted: 8/10/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy and a bit cooler with patchy smoke and a slight (20%) chance of isolated thunderstorms this afternoon and evening, partly cloudy with patchy smoke late tonight,
• AM clouds, sunny and a bit cooler with patchy smoke Saturday afternoon, partly cloudy with patchy evening smoke, partly cloudy with a slight (20%) chance of showers late Saturday night,
• Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler in the afternoon and evening, partly cloudy late Sunday night.
• highs 90-83 lows 58-60.
• Partly cloudy Monday and Monday night,
• Partly cloudy and a bit warmer Tuesday through Wednesday night,
• Then sunny Thursday.
• highs 85-92 lows 55-60. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Partly cloudy this afternoon and evening, mostly cloudy with patchy fog late tonight and Saturday AM, sunny in the afternoon, mostly cloudy with a slight (20%) chance of showers late Saturday night,
• Mostly cloudy with a slight (20%) chance of AM coastal showers while partly cloudy with a slight (20%) chance of AM inland showers, mostly cloudy and a bit warmer Sunday afternoon and  evening, partly cloudy late at night.
• highs near 64 lows near 55.
• Partly cloudy Monday and Monday night,
• Partly cloudy and a bit warmer Tuesday through Thursday,
• highs near 65 lows near 55. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy with patchy smoke and a slight (20%) of early afternoon showers, a (40%) chance of scattered showers and thunderstorms and a bit cooler late this afternoon and evening, partly cloudy with patchy smoke and a slight (20%) chance of showers and thunderstorms late tonight,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday, just partly cloudy at night,
• Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler Sunday afternoon, then just partly cloudy late Sunday night.
• snow level above 8,000 ft. tonight through Sunday, free air freezing level above 12,000 ft.
• highs 77-66 lows 54-46.
• Partly cloudy and a bit warmer Monday through Wednesday night,
• Then mostly sunny and a bit warmer Thursday.
• free air freezing level above 12,000 ft. Monday through Thursday.
• highs 68-75 lows 45-47.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show frontal systems moving in from the northwest Monday and Thursday. An Upper Level Low Pressure Trough (Shaded “U”shape with blue arrows) will help change our weather pattern for next week.

Note: The Perseid Meteor Shower peaks this weekend from Friday August 11th through Sunday August 13th. The moon will be about three quarters full so that will make viewing more difficult. Here cloud cover could be a problem as well as any residual smokey haze. Best viewing time will be after midnight Friday, Saturday and Sunday. Get away from the city lights and the sky won’t have the glow of city lights to obstruct your view.

 

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 117 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Oakridge: The Air Quality Index is 94 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 96 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 11 PM TONIGHT FOR THE WILLAMETTE NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING AND GUSTY OUTFLOW WINDS UNTIL 10 PM FRIDAY FOR THE EAST SLOPES OF THE CENTRAL OREGON CASCADES, THE CENTRAL MOUNTAINS OF OREGON, THE SOUTHERN BLUE AND STRAWBERRY MOUNTAINS OF OREGON, AND FOR THE CENTRAL BLUE MOUNTAINS OF OREGON.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 10 PM FRIDAY FOR THE DESCHUTES NATIONAL FOREST AND THE MINUS SISTERS RANGER DISTRICT, THE UMPQUA BASIN,  THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, AND THE SOUTHERN OREGON CASCADES.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 10 PM TONIGHT FOR THE UMPQUA BASIN,  THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON FRIDAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 PM FRIDAY FOR JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 AM SATURDAY FOR CROOK COUNTY, DESCHUTES COUNTY, GRANT COUNTY, WHEELER COUNTY, WASCO, JEFFERSON COUNTY, GILLAM COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, AND WALLOWA COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake, to include Shoalwater Bay to the north. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued Health Advisory for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy with a slight (20%) chance of isolated showers and thunderstorms this evening, mostly cloudy with patchy smoke tonight,
• AM clouds, partly cloudy and a bit cooler with patchy smoke Friday afternoon and Friday night,
• Mostly cloudy Saturday AM, mostly sunny and a bit cooler in the afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late Saturday night and Sunday AM, mostly cloudy in the afternoon and evening, just partly cloudy late Sunday night.
• lows 56-54 highs 85-78.
• Partly cloudy and a bit warmer Monday through Thursday,
• highs 80-87 lows near 52. (seasonal averages high 84 low 52)

 

________________

Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke and a slight (20%) chance of  isolated thunderstorms this evening, patchy smoke late tonight,
• Partly cloudy and a bit cooler with patchy smoke and a slight (20%) chance of isolated thunderstorms Friday afternoon and at night,
• Sunny and a bit cooler with patchy smoke Saturday, partly cloudy with patchy evening smoke, partly cloudy with a slight (20%) chance of showers late Saturday night,
• Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon and evening, partly cloudy late Sunday night.
• lows 59-57 warming to 60 Sunday night highs 90-85.
• Partly cloudy Monday and Monday night,
• Partly cloudy and a bit warmer Tuesday through Thursday AM, then sunny in the afternoon.
• highs 85-95 lows 56-60. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy with a slight (20%) chance of isolated inland thunderstorms, patchy fog late tonight,
• Mostly cloudy with patchy fog in the AM, partly cloudy Friday afternoon and evening, mostly cloudy with patchy fog late at night and Saturday AM, sunny in the afternoon, mostly cloudy with a slight (20%) chance of coastal showers late Saturday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Sunday and in the evening, partly cloudy late at night.
• lows near 55 highs 63-67.
• Partly cloudy and a bit cooler Monday and Monday night,
• Partly cloudy and a bit warmer Tuesday through Thursday,
• highs 63-69 lows 53-56. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy with patchy smoke and a good (50%) chance of scattered showers and thunderstorms this evening, patchy smoke with a good (50%) chance of showers and thunderstorms late tonight (under 0.10 in. of rain possible, more in storms),
• Partly cloudy with patchy AM smoke and a (40%) chance of isolated showers and thunderstorms, patchy smoke and a (40%) chance of scattered showers and thunderstorms and a bit cooler Friday afternoon and evening, just partly cloudy late Friday night and Saturday AM, mostly sunny and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday afternoon, partly cloudy with a slight (20%) chance of rain late at night,
• Partly cloudy with a slight (20%) chance of AM showers,  mostly cloudy and a bit cooler Sunday afternoon, then just partly cloudy late Sunday night.
• snow level above 8,000 ft. tonight through Sunday, free air freezing level above 12,000 ft.
• lows 56-46 highs 77-66.
• Partly cloudy and a bit warmer Monday through Wednesday night,
• Then mostly sunny and a bit warmer Thursday.
• free air freezing level above 12,000 ft. Monday through Thursday.
• highs 68-75 lows 45-47.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show a frontal system moving in from the northwest Sunday. An Upper Level Low Pressure Trough (Shaded “U”shape with blue arrows) will help change our weather pattern for next week.

Note: The Perseid Meteor Shower peaks this weekend from Friday August 11th through Sunday August 13th. The moon will be about three quarters full so that will make viewing more difficult. Here cloud cover could be a problem as well as any residual smokey haze. Best viewing time will be after midnight Friday, Saturday and Sunday. Get away from the city lights and the sky won’t have the glow of city lights to obstruct your view.

 

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 78 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 93 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 71 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 11 PM TONIGHT FOR THE WILLAMETTE NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING AND GUSTY OUTFLOW WINDS FROM 2 PM THIS AFTERNOON FROM 2 PM THIS AFTERNOON UNTIL 10 PM FRIDAY FOR THE EAST SLOPES OF THE CENTRAL OREGON CASCADES, THE CENTRAL MOUNTAINS OF OREGON
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 2 PM THIS AFTERNOON UNTIL 10 PM FRIDAY FOR THE DESCHUTES NATIONAL FOREST AND THE MINUS SISTERS RANGER DISTRICT, THE UMPQUA BASIN,  THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, AND THE SOUTHERN OREGON CASCADES.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM NOON UNTIL 10 PM TODAY FOR THE UMPQUA BASIN,  THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON FRIDAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 PM FRIDAY FOR JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• *AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 AM SATURDAY FOR CROOK COUNTY, DESCHUTES COUNTY, GRANT COUNTY, WHEELER COUNTY, WASCO, JEFFERSON COUNTY, GILLAM COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, AND WALLOWA COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake, to include Shoalwater Bay to the north. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued Health Advisory for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy and a bit cooler with patchy smoke this afternoon,  partly cloudy with a slight (20%) chance of isolated showers and thunderstorms this evening, mostly cloudy with patchy smoke tonight,
• AM clouds, mostly sunny and a bit cooler with patchy smoke Friday afternoon, partly cloudy Friday night,
• Mostly cloudy Saturday AM, mostly sunny and a bit cooler in the afternoon, partly cloudy in the evening, then mostly cloudy with a slight (20%) chance of rain late Saturday night.
• highs 90-84 lows near 56.
• Mostly cloudy with a slight (20%) chance of AM rain,  a bit cooler with a slight (20%) chance of showers Sunday afternoon and in the evening,  just partly cloudy late Sunday night,
• Then partly cloudy and a bit warmer Monday through Wednesday.
• highs 78-85 lows 54-52. (seasonal averages high 84 low 52)

 

________________

Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke and a bit cooler with a slight (20%) chance of  thunderstorms this afternoon and evening, patchy smoke late tonight,
• Partly cloudy and a bit cooler with patchy smoke and a slight (20%) chance of thunderstorms Friday afternoon and at night,
• Sunny and a bit cooler with patchy smoke Saturday, mostly clear with patchy evening smoke, partly cloudy with a slight (20%) chance of showers late Saturday night.
• highs 93-87 lows 62-57.
• Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon and evening, partly cloudy late Sunday night,
• Then partly cloudy and a bit warmer Monday through Wednesday.
• highs 84-90 lows near 58. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Central Oregon Coast Including Coos Bay and North Bend:

• Partly cloudy this afternoon and evening, mostly cloudy with a slight (20%) chance of isolated inland thunderstorms, patchy fog late tonight,
• Mostly cloudy with patchy fog in the AM, partly cloudy Friday afternoon and evening, mostly cloudy with patchy fog late at night and Saturday AM, sunny and a bit warmer in the afternoon, mostly clear in the evening, then mostly cloudy with a slight (20%) chance of showers late Saturday night.
• highs near 64 lows near 55.
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Sunday and in the evening, partly cloudy late at night,
• Partly cloudy and a bit cooler Monday and Monday night,
• Then partly cloudy and a bit warmer Tuesday through Wednesday.
• highs 65-70 lows near 53. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy with patchy smoke and a bit warmer with a good (50%) chance of scattered showers and thunderstorms this afternoon and evening (under 0.10 in. of rain possible, more in storms), patchy smoke with a slight (20%) chance of showers and thunderstorms late tonight (under 0.10 in. of rain possible, more in storms),
• Partly cloudy with patchy AM smoke and a slight (20%) chance of isolated showers, a (40%) chance of showers and thunderstorms and a bit cooler Friday afternoon and evening, just partly cloudy late Friday night and Saturday AM, mostly sunny and a bit cooler with a slight (20%) chance of isolated showers and thunderstorms and a bit cooler Saturday afternoon and evening, then partly cloudy late at night.
• snow level above 8,000 ft. today through Saturday, then free air freezing level 14,000 ft. late Saturday night.
• highs 82-74 lows 56-49.
• A mix of clouds and sun and a bit cooler Sunday, mostly cloudy in the evening, just partly cloudy late Sunday night,
• Partly cloudy Monday and at night,
• Then partly cloudy and a bit warmer Tuesday through Wednesday,
• free air freezing level above 14,000 ft. falling to 13,000 ft. Sunday afternoon, 13,000 ft. rising to 14,000 ft. Sunday night, 14,000 ft. Monday through Tuesday, 14,000 ft. rising to 15,000 ft. Tuesday night, then 15,000 ft. rising to 16,000 ft. Wednesday,
• highs 66-73 lows near 45.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show a frontal system moving in from the northwest Sunday. An Upper Level Low Pressure Trough (Shaded “U”shape with blue arrows) will help chance our weather pattern for next week.

Note: The Perseid Meteor Shower peaks this weekend from Friday August 11th through Sunday August 13th. The moon will be about three quarters full so that will make viewing more difficult. Here cloud cover   could be a problem as well as any residual smokey haze. Best viewing time will be after midnight Friday, Saturday and Sunday. Get away from the city lights and the sky won’t have the glow of city lights to obstruct your view.

 

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 147 in the Unhealthy category measuring Particulate Matter.

Oakridge: The Air Quality Index is 128 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 140 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 2 PM THIS AFTERNOON UNTIL 10 PM THURSDAY FOR THE WILLAMETTE NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 3 PM THIS AFTERNOON UNTIL 10 PM FRIDAY FOR THE DESCHUTES NATIONAL FOREST AND THE MINUS SISTERS RANGER DISTRICT.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM NOON UNTIL 10 PM TONIGHT FOR THE UMPQUA BASIN, THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, AND THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM NOON UNTIL 10 PM THURSDAY FOR THE UMPQUA BASIN, THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, AND THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH THURSDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES, THE UMPQUA BASIN,  THE WESTERN ROGUE RIVER, THE SISKIYOU NATIONAL FOREST,  BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY,  THE SOUTHERN OREGON CASCADES. THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FOREST,
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON FRIDAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 PM FRIDAY FOR JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 11 AM SATURDAY FOR CROOK COUNTY, DESCHUTES COUNTY, GRANT COUNTY, WHEELER COUNTY, WASCO, JEFFERSON COUNTY, GILLAM COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, AND WALLOWA COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake, to include Shoalwater Bay to the north. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued Health Advisory for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy with patchy smoke tonight,
• Partly cloudy with patchy smoke Thursday and at night,
• AM clouds, mostly sunny and a bit cooler Friday afternoon, partly cloudy Friday night,
• Mostly cloudy Saturday AM, partly cloudy and a bit cooler in the afternoon and evening, then mostly cloudy with a slight (20%) chance of showers Saturday night.
• lows near 58 highs 90-84.
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Sunday and in the evening,  just partly cloudy late Sunday night,
• Then partly cloudy and a bit warmer Monday through Wednesday.
• highs 78-85 lows 54-52. (seasonal averages high 84 low 52)

 

________________

Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke and a (40%) chance of scattered thunderstorms this evening, patchy smoke with a slight (20%) chance of isolated thunderstorms late tonight,
• Partly cloudy with patchy smoke and a bit cooler with a slight (20%) chance of  thunderstorms Thursday and in the evening, patchy smoke at night,
• Partly cloudy and a bit cooler with patchy smoke and a slight (20%) chance of thunderstorms Friday afternoon, partly cloudy with patchy smoke Friday night,
• Sunny and a bit cooler with patchy smoke Saturday, mostly clear with patchy evening smoke, partly cloudy with a slight (20%) chance of showers late at night.
• lows 62-57 highs 93-87.
• Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon and evening, partly cloudy Sunday night,
• Then partly cloudy and a bit warmer Monday through Wednesday,
• highs 84-90 lows near 57. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Central Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy tonight with patchy smoke and a slight (20%) chance of isolated inland thunderstorms, patchy fog late tonight,
• Cloudy with patchy AM coastal fog while patchy inland fog and smoke inland, partly cloudy Thursday afternoon and evening, mostly cloudy with patchy fog late Thursday night,
• Mostly cloudy with patchy fog in the AM, partly cloudy Friday afternoon and evening, mostly cloudy with patchy fog at night and Saturday AM, sunny and a bit warmer in the afternoon, mostly clear in the evening, then mostly cloudy with a slight (20%) chance of showers late Saturday night.
• lows near 55 highs near 64.
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Sunday and in the evening, partly cloudy late at night,
• Partly cloudy and a bit cooler Monday and Monday night,
• Then partly cloudy and a bit warmer Tuesday through Wednesday.
• highs 65-70 lows near 55. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy with patchy smoke and a (40%) chance of scattered showers and thunderstorms this evening, patchy smoke with a (40%) chance of showers and thunderstorms late tonight (under 0.10 in. of rain possible, more in storms),
• Partly cloudy with patchy smoke and a bit warmer with a good (50%) chance of showers and thunderstorms Thursday afternoon and evening (under 0.10 in. of rain possible, more in storms), patchy smoke with a slight (20%) chance of showers and thunderstorms late at night (under 0.10 in. of rain possible, more in storms),
• Partly cloudy with patchy AM smoke and a slight (20%) chance of isolated showers, a (40%) chance of showers and thunderstorms and a bit cooler Friday afternoon, and evening, just partly cloudy late Friday night and Saturday AM, mostly sunny and a bit cooler with a slight (20%) chance of isolated showers and thunderstorms and a bit cooler Saturday afternoon and evening, then partly cloudy late at night.
• snow level above 8,000 ft. tonight through Saturday evening, then free air freezing level above 12,000 ft. late Saturday night.
• lows 56-49 highs 76-73.
• A mix of clouds and sun and a bit cooler Sunday with a slight (20%) chance of showers in the afternoon and evening, just partly cloudy late Sunday night,
• Partly cloudy Monday and at night,
• Then partly cloudy and a bit warmer Tuesday through Wednesday,
• free air freezing level above 12,000 ft. Sunday AM, snow level above 8,000 ft. through Sunday evening, Monday, free air freezing level above 12,000 ft. late Sunday night and Wednesday,
• highs 66-73 lows near 49.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show a frontal systems moving in from the northwest Friday through Monday.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 177 in the Unhealthy category measuring Particulate Matter.

Oakridge: The Air Quality Index is 129 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 84 in the Moderate category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 2 PM THIS AFTERNOON UNTIL 10 PM THURSDAY FOR THE WILLAMETTE NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM 3 PM THIS AFTERNOON UNTIL 10 PM FRIDAY FOR THE DDSCHUTES NATIONAL FOREST AND THE MINUS SISTERS RANGER DISTRICT.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM NOON UNTIL 10 PM TONIGHT FOR THE UMPQUA BASIN, THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, AND THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH THURSDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES, THE UMPQUA BASIN,  THE WESTERN ROGUE RIVER, THE SISKIYOU NATIONAL FOREST,  BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY,  THE SOUTHERN OREGON CASCADES. THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FOREST,
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON FRIDAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON WEDNESDAY FOR GILLIAM COUNTY, GRANT COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, WALLLOWA COUNTY, AND WHEELER COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON SATURDAY FOR DESCHUTES COUNTY AND JEFFERSON COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake, to include Shoalwater Bay to the north. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued Health Advisory for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• A mix of clouds and sun with patchy smoke this afternoon, partly cloudy with patchy smoke tonight,
• Partly cloudy with patchy smoke Thursday and at night,
• AM clouds, mostly sunny and a bit cooler Friday afternoon, then partly cloudy Friday night.
• highs 90-87 lows near 58.
• Partly cloudy and a bit cooler Saturday, partly cloudy with a slight (20%) chance of showers Saturday night,
• Mostly cloudy with a slight (20%) chance of showers Sunday and in the evening,  just mostly cloudy late Sunday night,
• Partly cloudy with a slight (20%) chance of showers Monday, then just partly cloudy Monday night and Tuesday.
• highs 86-78 lows 56-52. (seasonal averages high 84 low 52)

________________

Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke and a slight (20%) chance of isolated thunderstorms and a bit cooler this afternoon, patchy smoke with isolated evening thunderstorms, a (40%) chance of isolated thunderstorms with patchy smoke late tonight,
• Partly cloudy with patchy smoke and a bit cooler with a slight (20%) chance of  thunderstorms Thursday and evening, patchy smoke at night,
• Partly cloudy and a bit cooler Friday and Friday night.
• highs 95-90 lows 62-64 cooling to 60 Friday night.
• Sunny and a bit cooler Saturday, mostly clear with a slight (20%) chance of thunderstorms at night,
• Sunny Sunday AM, partly cloudy with a slight (20%) chance of showers and a bit cooler in the afternoon and evening, mostly cloudy with a slight (20%) chance of showers Sunday night and Monday AM, then partly cloudy and a bit cooler Monday afternoon through Tuesday.
• highs 88-82 lows near 56. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Central Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy this afternoon patchy inland smoke, partly cloudy this evening and mostly cloudy with patchy inland smoke and a slight (20%) chance of isolated inland thunderstorms tonight, patchy fog late at night,
• Mostly cloudy with patchy AM coastal fog while patchy inland fog and smoke inland, partly cloudy Thursday afternoon and evening, just mostly cloudy late Thursday night,
• Mostly cloudy in the AM, partly cloudy Friday afternoon and at night.
• highs near 65 lows near 55.
• Partly cloudy Saturday, a slight (20%) chance of showers Saturday night,
• Partly cloudy and a bit warmer with a slight (20%) chance of showers Sunday afternoon through Monday AM, then just partly cloudy and a bit cooler Monday afternoon through Tuesday.
• highs near 65 lows near 55. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy and a bit cooler with patchy smoke and a (40%) chance of scattered showers and thunderstorms this afternoon and evening (under 0.10 in. of rain possible, more in storms), patchy smoke with a slight (20%) chance of showers and thunderstorms late tonight (under 0.10 in. of rain possible, more in storms),
• Partly cloudy with patchy smoke and a bit warmer with a (40%) chance of showers and thunderstorms Thursday afternoon (under 0.10 in. of rain possible, more in storms), patchy smoke with a good (50%) chance of showers and thunderstorms in the evening, patchy smoke with a slight (20%) chance of showers and thunderstorms late at night,
• Partly cloudy with patchy AM smoke and a slight (20%) chance of showers, a (40%) chance of showers and thunderstorms and a bit cooler Friday afternoon, a slight (20%) chance of evening showers and thunderstorms, then just partly cloudy late Friday night.
• snow level above 8,000 ft. today through Friday evening, then free air freezing level above 12,000 ft. late Friday night.
• highs near 78 lows 56-53.
• Partly cloudy in the AM, mostly sunny and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday afternoon and evening, partly cloudy late at night,
• Partly cloudy and a bit cooler Sunday with a slight (20%) chance of showers in the afternoon and Sunday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Monday and in the evening, then just partly cloudy late Monday night and Tuesday.
• free air freezing level above 12,000 ft. Saturday AM, snow level above 8,000 ft. Saturday afternoon and evening, free air freezing level above 12,000 ft. late Saturday night through Sunday night and Monday, then free air freezing level 11,000 ft. rising to 12,000 ft. Monday night and Tuesday.
• highs 74-63 warming to 65 Tuesday lows 49-43.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show a frontal systems moving in from the northwest Friday through Monday.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 155 in the Unhealthy category measuring Particulate Matter.

Oakridge: The Air Quality Index is 96 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 147 in the Unhealthy for Sensitive Groups category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 10 PM TONIGHT FOR THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, AND THE FREMONT-WINEMA NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS FROM NOON UNTIL 10 PM WEDNESDAY FOR THE UMPQUA BASIN, THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, AND THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH THURSDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES, THE UMPQUA BASIN,  THE WESTERN ROGUE RIVER, THE SISKIYOU NATIONAL FOREST,  BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY,  THE SOUTHERN OREGON CASCADES. THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FOREST,
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON FRIDAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL FURTHER NOTICE FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON WEDNESDAY FOR GILLIAM COUNTY, GRANT COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, WALLLOWA COUNTY, AND WHEELER COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON SATURTDAY FOR DESCHUTES COUNTY AND JEFFERSON COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake, to include Shoalwater Bay to the north. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued Health Advisory for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy with patchy smoke tonight,
• Partly cloudy in the AM, mostly sunny with patchy smoke Wednesday afternoon, partly cloudy with patchy smoke Wednesday night and Thursday AM, partly cloudy in the afternoon and at night,
• AM clouds, mostly sunny and a bit cooler Friday afternoon, then partly cloudy Friday night.
• lows near 60 highs 92-87.
• Partly cloudy and a bit cooler Saturday, partly cloudy with a slight (20%) chance of showers Saturday night through Monday evening, the just partly cloudy late Monday night and Tuesday.
• highs 86-78 lows 56-52. (seasonal averages high 84 low 52)

________________

Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke and a slight (20%) chance of isolated thunderstorms tonight and Wednesday (a bit cooler), patchy smoke scattered evening thunderstorms late Wednesday night,
• Partly cloudy with patchy smoke and a bit cooler with a slight (20%) chance of  thunderstorms Thursday and evening, patchy smoke at night,
• Partly cloudy and a bit cooler Friday and Friday night.
• lows 63-60 highs 95-92.
• Mostly sunny and a bit cooler Saturday, mostly clear at night,
• Sunny Sunday AM, partly cloudy with a slight (20%) chance of showers and a bit cooler in the afternoon and evening, mostly cloudy with a slight (20%) chance of showers Sunday night and Monday AM, then partly cloudy and a bit cooler Monday afternoon through Tuesday.
• highs 87-84 lows 57-60 cooling to 58 Tuesday. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Central Oregon Coast Including Coos Bay and North Bend:

• Partly cloudy this evening, mostly cloudy late tonight with patchy coastal fog late tonight while patchy inland smoke late at night,
• Cloudy with patchy AM coastal fog and partly cloudy Wednesday afternoon while patchy inland smoke and a slight (20%) chance of inland thunderstorms in the afternoon, partly cloudy in the evening and mostly cloudy with patchy inland smoke and a slight (20%) chance of isolated inland thunderstorms Wednesday night, patchy fog late at night,
• Mostly cloudy with patchy AM coastal fog while patchy inland fog and smoke inland, partly cloudy Thursday afternoon and evening, just mostly cloudy late Thursday night,
• Partly cloudy Friday and at night.
• lows near 55 highs near 65.
• Partly cloudy Saturday and Saturday night,
• Partly cloudy Sunday AM, mostly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon through Monday AM, then just partly cloudy and a bit cooler Monday afternoon through Tuesday.
• highs 65-69 cooling to 66 Monday lows near 56. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy with patchy smoke and a slight (20%) chance of showers and thunderstorms this evening, partly cloudy with patchy smoke late tonight,
• Partly cloudy and a bit cooler with patchy smoke and a (30%) chance of showers and thunderstorms Wednesday afternoon and evening, a slight (20%) chance of showers and thunderstorms late at night,
• Partly cloudy and a bit warmer with a slight (20%) chance of showers and thunderstorms Thursday afternoon, a good (50%) chance of showers and thunderstorms in the evening, just partly cloudy late at night,
• Partly cloudy with a (40%) chance of afternoon showers and thunderstorms and a bit cooler Friday afternoon, a slight (20%) chance of evening showers and thunderstorms, then partly cloudy late Friday night.
• snow level above 8,000 ft. tonight through Thursday night, free air freezing level 12,000 ft. late Thursday night and Friday AM, snow level above 8,000 ft. Friday afternoon and evening, free air freezing level above 12,000 ft. late Friday night.
• lows 57-53 highs 80-77.
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday afternoon and evening, partly cloudy late at night,
• Partly cloudy and a bit cooler Sunday with a slight (20%) chance of showers in the afternoon and Sunday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Monday and in the evening, then just partly cloudy late Monday night and Tuesday.
• free air freezing level above 12,000 ft. Saturday AM, snow level above 8,000 ft. Saturday afternoon and evening, free air freezing level above 12,000 ft. late Saturday night through Sunday night and Monday, then free air freezing level 11,000 ft. rising to 12,000 ft. Monday night and Tuesday.
• highs 74-62 lows 49-43.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show a couple of weak cold fronts moving in from the northwest next Saturday through Monday.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 77 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 80 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 67 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR ABUNDANT LIGHTNING ON DRY FUELS UNTIL 10 PM TONIGHT FOR THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY, AND THE SOUTHERN OREGON CASCADES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY,  THE SOUTHERN OREGON CASCADES. THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FOREST,  THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 7 PM THIS EVENING FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL FURTHER NOTICE FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON WEDNESDAY FOR GILLIAM COUNTY, GRANT COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, WALLLOWA COUNTY, AND WHEELER COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON SATURTDAY FOR DESCHUTES COUNTY AND JEFFERSON COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy and Hot today with more patchy smoke, partly cloudy with patchy smoke late tonight,
• Partly cloudy in the AM, mostly sunny and a bit cooler with patchy smoke Wednesday afternoon, partly cloudy with patchy smoke Wednesday night through Thursday AM, then partly cloudy in the afternoon through Friday night.
• highs 93-90 lows near 60.
• AM clouds, mostly sunny and a bit cooler Friday, partly cloudy at night,
• Then partly cloudy and a bit cooler Saturday through Monday,
• highs 86-84 lows 57-54. (seasonal averages high 84 low 52)

________________

Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke and a slight (20%) chance of isolated thunderstorms this afternoon and tonight,
• Partly cloudy with patchy smoke with a slight (20%) chance of isolated thunderstorms Wednesday and in the evening, isolated thunderstorms late Wednesday night,
• Partly cloudy and a bit cooler with isolated thunderstorms Thursday and at night.
• highs near 95 lows near 63.
• Partly cloudy and a bit cooler with isolated thunderstorms Friday, just party cloudy at night,
• Partly cloudy and a bit warmer Saturday through Sunday, then partly cloudy with a slight (20%) chance of showers Sunday night and Monday (a bit cooler).
• highs 92-82 lows 60-57 warming back to 60 Monday. (seasonal averages high 86 low 56)

_____________________

Forecast for The South Central Oregon Coast Including Coos Bay and North Bend:

• Partly cloudy this afternoon at the shore while partly cloudy with patchy inland smoke and a slight (20%) chance of inland isolated thunderstorms and a bit cooler this afternoon and evening, patchy coastal fog late at night while patchy inland smoke tonight,
• Mostly cloudy with patchy AM coastal fog while patchy AM inland smoke Wednesday, partly cloudy with patchy inland smoke, just mostly cloudy at the shore at night while patchy evening inland smoke with a slight (20%) chance of isolated inland thunderstorms Wednesday night,
• Mostly cloudy with a slight (20%) of isolated thunderstorms in the AM, partly cloudy with a slight (20%) of isolated thunderstorms Thursday in the afternoon and evening, then just mostly cloudy late Thursday night.
• highs near 65 lows near 55.
• Partly cloudy and a bit cooler Friday through Sunday (a bit warmer Sunday), partly cloudy with a slight (20%) chance of showers Sunday night and Monday AM, then just partly cloudy and a bit cooler Monday afternoon.
• highs 64-66 cooling to 62 Monday lows 56-58. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy and a bit warmer with patchy smoke and a slight (20%) chance of showers and thunderstorms this afternoon and evening, partly cloudy with patchy smoke late tonight,
• Partly cloudy and a bit cooler with patchy smoke and a (30%) chance of showers and thunderstorms Wednesday afternoon and evening, a slight (20%) chance of showers and thunderstorms at night,
• Partly cloudy and a bit warmer with a slight (20%) chance of showers and thunderstorms Thursday afternoon and evening, then just partly cloudy late Thursday night.
• snow level above 8,000 ft. today through Thursday evening, then free air freezing level 12,000 ft. late Thursday night.
• highs 82-77 warming to 80 Thursday lows 57-55.
• Partly cloudy with a slight (20%) chance of afternoon showers and thunderstorms and a bit cooler Friday afternoon and evening, partly cloudy late at night,
• Partly cloudy with a slight (20%) chance of showers and thunderstorms Saturday afternoon and evening, partly cloudy late at night and Sunday, a bit cooler Sunday afternoon, a slight (20%) chance of showers and thunderstorms late Sunday night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Monday.
• free air freezing level 12,000 ft. Friday AM, snow level above 8,000 ft. Friday afternoon and evening, free air freezing level above 12,000 ft. late Friday night and Saturday AM, snow level above 8,000 ft. Saturday afternoon and evening, free air freezing level above 12,000 ft. Saturday night through Sunday evening, then snow level above 8,000 ft. Late Sunday night and Monday.
• highs 76-70 lows 53-48.

 

________________

**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________

Here is my weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

________________

 

An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show a couple of weak cold fronts moving in from the northwest next Saturday through Monday.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 87 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 66 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 73 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

__________________

Advisories:

• A RED FLAG WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FOREST, THE UMPQUA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FOREST,  THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 7 PM TUESDAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL FURTHER NOTICE FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON WEDNESDAY FOR GILLIAM COUNTY, GRANT COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, WALLLOWA COUNTY, AND WHEELER COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON SATURTDAY FOR DESCHUTES COUNTY AND JEFFERSON COUNTY.
• The Oregon Health Authority issued a Health Advisory today for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory today for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly clear with patchy smoke tonight,
• Partly cloudy and Hot Tuesday with more patchy smoke, partly cloudy with patchy smoke late at night and Wednesday AM, partly cloudy and a bit cooler with patchy smoke in the afternoon and evening, partly cloudy late Wednesday night through Thursday night.
• lows near 60 highs 93-90.
• Mostly sunny and a bit cooler Friday, partly cloudy at night,
• Then partly cloudy and a bit cooler Saturday through Monday,
• highs 86-84 lows 57-54. (seasonal averages high 84 low 52)

________________

Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy with patchy smoke and a slight (20%) chance of isolated thunderstorms tonight,
• Partly cloudy with patchy smoke Tuesday and a slight (20%) chance of isolated thunderstorms in the afternoon and Tuesday night,
• Partly cloudy with patchy smoke with a slight (20%) chance of isolated thunderstorms Wednesday and in the evening, isolated thunderstorms late Wednesday night,
• Partly cloudy and a bit cooler with isolated thunderstorms Thursday and at night.
• lows near 63 highs near 95.
• Partly cloudy and a bit cooler with isolated showers Friday, just party cloudy at night,
• Partly cloudy and a bit warmer Saturday through Sunday, then partly cloudy with a slight (20%) chance of showers Sunday night and Monday (a bit cooler).
• highs 92-82 lows 60-57 warming back to 60 Monday. (seasonal averages high 86 low 56)

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Forecast for The South Central Oregon Coast Including Coos Bay and North Bend:

• Partly cloudy this evening and mostly cloudy late tonight with patchy coastal fog while patchy inland smoke and a slight (20%) chance of inland thunderstorms tonight,
• Partly cloudy with patchy AM coastal fog and partly cloudy Tuesday afternoon while partly cloudy with patchy inland smoke and a slight (20%) chance of inland isolated thunderstorms and a bit cooler Tuesday afternoon and evening, patchy coastal fog late at night while patchy inland smoke Tuesday night,
• Mostly cloudy with patchy AM coastal fog while patchy AM inland smoke Wednesday, partly cloudy with patchy inland smoke, just mostly cloudy at the shore at night while patchy evening inland smoke with a slight (20%) chance of isolated inland thunderstorms Wednesday night,
• Mostly cloudy with a slight (20%) of isolated thunderstorms in the AM, partly cloudy with a slight (20%) of isolated thunderstorms Thursday in the afternoon and evening, then just mostly cloudy late Thursday night.
• lows near 55 highs near 65.
• Partly cloudy and a bit cooler Friday through Sunday (a bit warmer Sunday), partly cloudy with a slight (20%) chance of showers Sunday night and Monday AM, then just partly cloudy and a bit cooler Monday afternoon.
• highs 64-66 cooling to 62 Monday lows 56-58. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Partly cloudy with patchy smoke and a slight (20%) chance of showers and thunderstorms this evening, just partly cloudy with patchy smoke late tonight,
• Partly cloudy and a bit warmer with patchy smoke and a slight (20%) chance of showers and thunderstorms Tuesday afternoon and evening, partly cloudy with patchy smoke late at night,
• Partly cloudy and a bit cooler with patchy smoke and a (30%) chance of showers and thunderstorms Wednesday afternoon and evening, a slight (20%) chance of showers and thunderstorms at night,
• Partly cloudy and a bit warmer with a slight (20%) chance of showers and thunderstorms Thursday afternoon and evening, then just partly cloudy late Thursday night.
• snow level above 8,000 ft. tonight through Thursday evening, then free air freezing level 12,000 ft. late Thursday night.
• lows 58-55 highs 79-77 warming to 80 Thursday.
• Partly cloudy with a slight (20%) chance of afternoon showers and thunderstorms and a bit cooler Friday afternoon and evening, partly cloudy late at night,
• Partly cloudy with a slight (20%) chance of showers and thunderstorms Saturday afternoon and evening, partly cloudy late at night and Sunday, a bit cooler Sunday afternoon, a slight (20%) chance of showers and thunderstorms late Sunday night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Monday.
• free air freezing level 12,000 ft. Friday AM, snow level above 8,000 ft. Friday afternoon and evening, free air freezing level above 12,000 ft. late Friday night and Saturday AM, snow level above 8,000 ft. Saturday afternoon and evening, free air freezing level above 12,000 ft. Saturday night through Sunday evening, then snow level above 8,000 ft. Late Sunday night and Monday.
• highs 76-70 lows 53-48.

 

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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Here is my new weekly weather quiz question. What is the “Backwater Effect?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An Upper Level High Pressure Ridge (“Arch”shape with blue arrows) is still dominating our weather picture. The graphics for days 3-7 show a couple of weak cold fronts moving in from the northwest next Sunday and Monday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 64 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 45 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 55 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• A RED FLAG WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FOREST, THE UMPQUA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL 7 PM TUESDAY FOR BENTON COUNTY, CLACKAMAS COUNTY, CLATSOP COUNTY, COLUMBIA COUNTY, HOOD RIVER COUNTY, LANE COUNTY, LINCOLN COUNTY, LINN COUNTY, MARION COUNTY, MULTNOMAH COUNTY, POLK COUNTY, TILLAMOOK COUNTY, WASHINGTON COUNTY, YAMHILL COUNTY,  CLARK COUNTY, DESCHUTTES COUNTY AND JEFFERSON COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL FURTHER NOTICE FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• AN AIR  QUALITY ALERT IS IN EFFECT UNTIL NOON WEDNESDAY FOR DESCHUTES COUNTY, JEFFERSON COUNTY, GILLIAM COUNTY, GRANT COUNTY, MORROW COUNTY, SHERMAN COUNTY, UMATILLA COUNTY, UNION COUNTY, WALLLOWA COUNTY, AND WHEELER COUNTY.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

 

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• A mix of clouds and sun and a bit warmer, hot, with patchy smoke this afternoon, partly cloudy with patchy smoke tonight,
• Partly cloudy and Hot Tuesday with patchy smoke, partly cloudy with patchy smoke late at night and Wednesday AM, mostly sunny and a bit cooler with patchy smoke in the afternoon and evening, partly cloudy with patchy smoke late Wednesday night.
• highs 92-94 cooling back to 92 Wednesday lows 59-57 warming back to 59 Wednesday.
• Partly cloudy and a bit cooler Thursday and Thursday night,
• Mostly sunny and a bit cooler Friday, partly cloudy at night,
• Then partly cloudy and a bit cooler Saturday through Sunday.
• highs 90-83 lows 58-56. (seasonal averages high 84 low 52)

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Eugene-Springfield Pollen Count

Grass………. Low (3)
Trees………. Low (3)
Last Counted: 8/2/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

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Forecast for Roseburg:

• Partly cloudy with patchy smoke and a slight (20%) chance of isolated thunderstorms and a bit warmer this afternoon through Tuesday evening, partly cloudy with patchy smoke Tuesday night,
• Partly cloudy with patchy smoke and a bit cooler with a slight (20%) chance of isolated thunderstorms Wednesday and Wednesday night.
• highs 95-93 lows near 62.
• Partly cloudy and a bit cooler with isolated thunderstorms Thursday, a slight (20%) chance of evening thunderstorms, mostly clear late Thursday night,
• AM sun, partly cloudy and a bit cooler Friday afternoon, mostly clear at night,
• Mostly sunny and a bit warmer Saturday, mostly clear at night,
• Sunny Sunday AM, then partly cloudy and a bit warmer Sunday afternoon.
• highs 89-86 warming to 90 Sunday lows 62-57. (seasonal averages high 86 low 56)

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Forecast for The South Central Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy with patchy AM fog while patchy inland AM smoke, mostly sunny and a bit cooler with patchy inland smoke this afternoon, partly cloudy with patchy evening coastal fog while party cloudy with patchy inland smoke and a slight (20%) chance of inland thunderstorms late tonight,
• Partly cloudy with patchy AM coastal fog, patchy inland smoke with a slight (20%) chance of inland isolated thunderstorms and a bit cooler Tuesday afternoon and evening, patchy coastal fog late at night while patchy inland smoke Tuesday night,
• Mostly cloudy with patchy AM fog, partly cloudy patchy smoke with a slight (20%) chance of isolated thunderstorms Wednesday afternoon and at night.
• highs 65-63 lows near 55.
• Mostly cloudy in the AM, partly cloudy with a slight (20%) of isolated thunderstorms Thursday AM, just partly cloudy afternoon and Thursday night,
• Then partly cloudy and a bit cooler Friday through Sunday.
• highs 69-63 warming to 65 Sunday lows near 55. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Partly cloudy and a bit warmer with patchy smoke and a slight (20%) chance of showers and thunderstorms this afternoon and evening, just partly cloudy with patchy smoke late tonight,
• Partly cloudy and a bit warmer with patchy smoke and a slight (20%) chance of showers and thunderstorms Tuesday afternoon and evening, partly cloudy with patchy smoke late at night,
• Partly cloudy with patchy smoke and a slight (20%) chance of showers and thunderstorms Wednesday and at night.
• snow level above 8,000 ft. today and tonight, free air freezing level above 12,000 ft. Tuesday AM, snow level above 8,000 ft. Tuesday afternoon and Tuesday night, free air freezing level above 12,000 ft. Wednesday AM, then snow level above 8,000 ft Wednesday afternoon and Wednesday night.
• highs 80-82 lows 57-55.
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Thursday and in the evening, just partly cloudy late Thursday night,
• Partly cloudy with a slight (20%) chance of afternoon showers and thunderstorms and a bit cooler Friday afternoon and evening, partly cloudy late at night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday afternoon and evening, partly cloudy at night,
• Then partly cloudy and a bit cooler Sunday.
• snow level above 8,000 ft. Thursday and Thursday evening, free air freezing level 12,000 ft. late Thursday night and Friday AM, snow level above 8,000 ft. Friday afternoon and evening, free air freezing level above 12,000 ft. late Friday night and Saturday AM, then snow level above 8,000 ft. Saturday afternoon and evening, then free air freezing level above 12,000 ft. Saturday night and Sunday.
• highs 82-73 lows 54-52.

 

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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