Here is my new weekly weather quiz question. What is the “Bergeron Process?” 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 (Shaded “Arch” shape with blue arrows) will take over for some warming, but low pressure to the north (Shaded “U” shape) will help with a slight change. The graphics for days 1-3 show a frontal system moving into the Pacific Northwest late Wednesday into Thursday. The graphics for days 3-7 show the next frontal system approaching Oregon, but falling apart Sunday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 54 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 149 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 109 in the Unhealthy for Sensitive Groups 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 FOR ABUNDANT LIGHTING AND DRY FUELS FROM UNTIL 11 PM TODAY FOR THE WESTERN KLAMATH NATIONAL FOREST, THE UMPQUA NATIONAL FOREST, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FORECAST, AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN AND WESTERN LAKE COUNTIES.
• A RED FLAG WARNING IS IN EFFECT FROM 1 PM UNTIL 8 PM WEDNESDAY FOR ABUNDANT LIGHTING AND DRY FUELS FOR THE WESTERN KLAMATH NATIONAL FOREST, THE UMPQUA NATIONAL FOREST, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN,  THE FREMONT-WINEMA NATIONAL FORECAST, AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN AND WESTERN LAKE COUNTIES.
• A RED FLAG WARNING IS IN EFFECT FROM NOON UNTIL 5 PM WEDNESDAY FOR ABUNDANT LIGHTING AND DRY FUELS FOR DESCHUTES NATIONAL FOREST, THE MINUS SISTERS RANGER DISTRICT, THE CENTRAL MOUNTAINS OF OREGON, THE SOUTHERN BLUE AND STRAWBERRY MOUNTAINS OF OREGON, THE NORTHERN BLUE MOUNTAINS, THE CENTRAL BLUE MOUNTAINS, AND THE WALLOWA DISTRICT.
• A FLASH FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING FOR THE SOUTHERN OREGON MOUNTAINS AND THE SISKIYOU MOUNTAINS.
• AN AIR QUALITY ALERT IS IN EFFECT UNTIL FURTHER NOTICE FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, THE CURRY COUNTY COAST, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE KLAMATH BASIN.
• The Oregon Health Authority issued a Health Advisory 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.
• A Health Advisory remains in effect 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.
• A Health Advisory remains in effect 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.
• A Health Advisory remains in effect 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 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:

• Clear with areas of smoke tonight,
• AM clouds and sun with patchy smoke, mostly sunny and a bit cooler Wednesday afternoon, mostly clear in the evening, cloudy with a slight (20%) chance of showers late Wednesday night and Thursday AM, partly cloudy and a bit cooler with a slight (20%) chance of  showers in the afternoon and evening,  just partly cloudy and a bit cooler late Thursday night,
• Mostly sunny and a bit warmer Friday, then clear at night.
• lows 58-48 highs 84-78 warming to 83 Friday.
• Sunny and a bit warmer Saturday, clear Saturday night,
• Sunny and a bit warmer with patchy smoke Sunday, clear with patchy smoke at night,
• Sunny and a bit cooler Monday, clear with patchy smoke Monday night,
• Mostly sunny and a bit cooler with patchy smoke Tuesday.
• highs 83-93 cooling to 88 Tuesday lows 54-56. (seasonal averages high 82 low 51)

 

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Eugene-Springfield Pollen Count

Grass………. Low (2)
Trees………. Low (2)
Last Counted: 8/16/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

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Forecast for Roseburg:

• Mostly clear with patchy evening smoke, partly cloudy with areas of smoke late tonight,
• Mostly cloudy with patchy smoke Wednesday AM, sunny and a bit cooler with areas of afternoon smoke, mostly clear in the evening, mostly cloudy with patchy smoke and a slight (20%) chance of showers late Wednesday night,
• Mostly cloudy with areas of morning smoke and a slight (20%) chance of showers Thursday AM, sunny and a bit cooler with patchy smoke in the  afternoon, just mostly clear Thursday night,
• Sunny and a bit warmer Friday, then clear at night.
• lows 60-52 warming to 54 Friday night highs 85-80 warming back to 85 Friday.
• Sunny and a bit warmer Saturday, Sunday, and Monday, clear at night,
• Then sunny and a bit cooler Tuesday.
• highs 93-98 cooling to 94 Tuesday lows 59-62. (seasonal averages high 84 low 55)

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

• Partly cloudy tonight,
• Mostly cloudy Wednesday AM, sunny and a bit warmer in the afternoon, mostly clear in the evening, mostly cloudy with a slight  (20%) chance of showers late Wednesday night,
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit cooler Thursday afternoon, mostly clear at night,
• Mostly sunny and a bit cooler Friday, clear Friday night.
• lows 56-50 highs 67-62.
• Sunny and a bit warmer Saturday and Sunday, clear both nights,
• Sunny Monday, mostly clear at night,
• Then mostly sunny Tuesday.
• highs near 66 lows 53-55. (seasonal averages high 66 low 53)

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Forecast for the Cascades in Lane County:

• Party cloudy with smoke and a slight (20%) chance of showers and thunderstorms tonight and Wednesday AM, partly cloudy with more smoke and a bit cooler Wednesday afternoon and in the evening, mostly cloudy with patchy smoke and a slight (20%) chance of showers late Wednesday night,
• Mostly cloudy with patchy smoke and a slight (20%) chance of AM showers, mostly sunny and a bit cooler with patchy smoke Thursday afternoon, partly cloudy with patchy smoke at night,
• Mostly sunny and a bit warmer with patchy smoke Friday, clear with patchy smoke Friday night.
• free air freezing level 15,000 ft. tonight, 14,000 ft. Wednesday afternoon, snow level above 8,000 ft. late Wednesday night and Thursday AM, free air freezing level 13,000 ft. Thursday afternoon and Thursday night, 14,000 ft. Friday, then 15,000 ft. Friday night.
• lows 52-42 warming to 47 Friday night highs 72-66 warming to 75 Friday.
• Patchy AM smoke, sunny and a bit warmer with areas of smoke Saturday afternoon, clear with areas of smoke Saturday night,
• Sunny with areas of smoke Sunday (a bit warmer) and Monday, clear with areas of smoke both nights,
• Then mostly sunny with areas of smoke and a bit cooler Tuesday.
• free air freezing level 15,000 ft. rising to 16,000 ft. Saturday afternoon, 16,000 ft. Saturday night through Monday, 16,000 ft. falling to 15,000 ft. Monday night, then 15,000 ft. Tuesday.
• highs 83-80 lows near 53.

 

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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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