Here is my 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 through the Pacific Northwest late today into Thursday. The graphics for days 3-7 show the next frontal system approaching Oregon Tuesday, and another front approaching Thursday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 27 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 98 in the Moderate  category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• A RED FLAG WARNING IS IN EFFECT UNTIL 8 PM THIS EVENING FOR ABUNDANT LIGHTING AND DRY FUELS FOR 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 UNTIL 10 PM TONIGHT FOR ABUNDANT LIGHTING AND DRY FUELS FOR THE NORTHERN BLUE MOUNTAINS, THE CENTRAL BLUE MOUNTAINS, AND THE WALLOWA DISTRICT.
• AN AIR QUALITY ALERT IS IN EFFECT UNTIL 5 PM THURSDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, THE CURRY COUNTY COAST, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, EASTERN KLAMATH COUNTY, WESTERN LAKE 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:

• Partly cloudy with occasional sprinkles this evening, cloudy with a slight (20%) chance of showers late tonight and Thursday AM, a mix of clouds and sun and a bit cooler in the afternoon, mostly clear and a bit cooler late Thursday night,
• Mostly sunny and a bit warmer Friday, clear at night,
• Sunny and a bit warmer Saturday, clear Saturday night.
• lows 58-48 warming to 54 Saturday night highs 74-88.
• Sunny and a bit warmer with patchy smoke Sunday and Monday, clear with patchy smoke both nights,
• AM patchy smoke, sunny and a bit cooler Tuesday afternoon, mostly clear at night,
• Then mostly sunny and a bit cooler Wednesday.
• highs 93-86 lows near 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:

• Partly cloudy this evening, mostly cloudy with patchy smoke and a slight (20%) chance of areas of drizzle late tonight,
• Cloudy with areas of smoke and a slight (20%) chance of drizzle Thursday AM, partly cloudy and a bit cooler with patchy smoke in the  afternoon, just mostly clear Thursday night,
• Sunny and a bit warmer Friday, clear at night,
• Sunny and a bit warmer Saturday, then clear Saturday night.
• lows 60-53 warming to 59 Saturday night highs 80-93.
• Sunny and a bit warmer Sunday and Monday, clear both nights,
• Sunny and a bit cooler Tuesday, mostly clear at night,
• Then mostly sunny and a bit cooler Wednesday.
• highs 99-93 lows near 60. (seasonal averages high 84 low 55)

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

• Mostly cloudy with a slight (20%) chance of areas of drizzle late tonight,
• Cloudy with a slight (20%) chance of areas of AM drizzle, partly cloudy and a bit cooler Thursday afternoon, partly cloudy at night and Friday AM, sunny and a bit cooler Friday afternoon, clear at night,
• Sunny and a bit warmer Saturday, clear Saturday night.
• lows 55-50 highs 64-62 warming to 68 Saturday.
• Sunny Sunday, mostly clear Sunday night,
• Mostly sunny and a bit cooler Monday and Tuesday, mostly clear both nights,
• AM clouds, then sunny Wednesday,
• highs 68-66 lows near 55. (seasonal averages high 66 low 53)

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Forecast for the Cascades in Lane County:

• Partly cloudy with more smoke this evening, mostly cloudy with patchy smoke  late tonight,
• Mostly cloudy with patchy smoke and a slight (20%) chance of AM showers, partly cloudy and a bit cooler with patchy smoke and a slight (20%) chance of drizzle Thursday afternoon, mostly clear with patchy smoke at night,
• Sunny and a bit warmer with patchy smoke Friday, clear with patchy smoke Friday night,
• Patchy AM smoke, sunny and a bit warmer with areas of smoke Saturday afternoon, clear with areas of smoke Saturday night.
• free air freezing level 12,000 ft. tonight, snow level above 8,000 ft. Thursday, free air freezing level above 12,000 ft. Thursday night through Saturday night.
• lows 49-44 warming to 53 Saturday night highs 64-80.
• Sunny with areas of smoke and a bit warmer Sunday, clear with areas of smoke at night,
• Sunny with areas of smoke Monday, clear with areas of smoke Monday night,
• Then sunny and a bit cooler Tuesday and Wednesday, clear with areas of smoke Tuesday night.
• free air freezing level above 12,000 ft. Sunday through Wednesday.
• highs 83-78 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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