Here is my new weekly weather quiz question. What is “Upwelling?” Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. Good luck.

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An upper level low (Shaded “U” shape in blue arrows) has cooled us down with increasing onshore airflow. It will continue to slide to the south from off the British Columbia coast and then move eastward. The cool-down should last most of the week but the computer  models are conflicted over the chance of any precipitation. A frontal system will be on its way to us today bringing the slight chance of drizzle at night. By Thursday a frontal system will have passed through the Pacific Northwest continuing the slight chance of showers. As much as we need some rain I’m sure most of us are hoping that it is dry and warm for the long Labor day weekend September 3rd through 5th, but it is too soon to make that prediction.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 12 in the Good 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 A COMBINATION OF STRONG WINDS AND LOW RELATIVE HUMIDITY UNTIL 9 PM TONIGHT FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE THE BLM LAND IN EASTERN LAKE COUNTY AND WESTERN HARNEY COUNTY.
• A RED FLAG WARNING IS IN EFFECT FOR A COMBINATION OF STRONG WINDS AND LOW RELATIVE HUMIDITY UNTIL 8 PM TONIGHT FOR THE BLM LAND IN BURNS, VALE AND THE BAKER VALLEY.
• A health advisory remains in effect for the Ross Island Lagoon and the mouth of the lagoon as it connects to the Holgate Channel. Ross Island Lagoon is located about one river mile south of downtown Portland in Multnomah County. The advisory is being issued due to visual confirmation of a blue-green algae bloom in the lagoon. Oregon Public Health officials advise people to avoid swallowing or inhaling water droplets as a result of swimming or high-speed water activities, such as water skiing and power boating in areas where blooms are identified.
• A health advisory remains in effect for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the presence of high levels of blue-green algae and associated toxins that can be harmful to people and animals. Swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing and power boating, should be avoided in areas where blooms are identified. Although toxins are not absorbed through the skin, contact with cells from a bloom can cause skin irritation and a red, puffy rash in individuals with skin sensitivities, or those who develop rashes easily.
• A Blue-Green Algae health advisory remains in effect for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake ONLY. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.

 

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

• Mostly sunny and a bit cooler this afternoon, partly cloudy tonight,
• Cloudy with patchy fog and drizzle Tuesday AM, partly cloudy in the afternoon and evening, cloudy with a slight (20%) chance of showers late Tuesday night,
• Mostly cloudy and a bit cooler Wednesday with a good (50%) chance of showers, then a slight (20%) chance of showers late Wednesday night,
• highs 78-72 lows 53-55 cooling to 52 Wednesday night.
• A mix of clouds and sun and a bit cooler with a (30%) chance of showers Thursday afternoon, mostly cloudy with a slight (20%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Thursday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers and a bit warmer Friday, mostly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Friday night,
• A mix of clouds and sun and a bit warmerer Saturday, mostly cloudy in the evening, then partly cloudy late Saturday night through Sunday afternoon (a bit cooler in the afternoon).
• highs 72-78 cooling to 76 Sunday lows 55-50. (seasonal averages high 81 low 50)

 

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Forecast for Roseburg:

• Sunny and a bit cooler this afternoon, mostly clear this evening, mostly cloudy late tonight and Tuesday AM, partly cloudy and a bit cooler in the afternoon, partly cloudy with a slight (20%) chance of showers late Tuesday night,
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Wednesday, partly cloudy in the evening, then mostly cloudy  late Wednesday night.
• highs 84-74 lows 56-54.
• Mostly cloudy Thursday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon, partly cloudy with a sight (20%) of showers Thursday night and Friday, mostly cloudy with a slight (20%) chance of showers Friday evening, just mostly cloudy at night,
• Then partly cloudy Saturday through Sunday.
• highs 78-80 lows near 54. (seasonal averages high 83 low 54)

 

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

• Mostly cloudy and a bit warmer this afternoon, partly cloudy this evening, mostly cloudy with patchy coastal fog late tonight,
• Mostly cloudy  with patchy AM fog, partly cloudy and a bit warmer with a slight (20%) chance of coastal showers Tuesday afternoon, a (30%) chance of coastal showers late at night while partly cloudy in the evening inland and mostly cloudy with a sight (20%) chance of showers inland late Tuesday night,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Wednesday, partly cloudy in the evening, then mostly cloudy Wednesday night.
• highs 64-67 cooling back to 64 Wednesday lows 52-54.
• Mostly cloudy in the AM, partly cloudy with a slight (20%) chance of showers Thursday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon and Thursday night,
• Mostly cloudy with a slight (20%) chance of showers Friday and Friday night ,
• Then partly cloudy Saturday through Sunday.
• highs near 66 lows near 53. (seasonal averages high 66 low 52)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit cooler today, partly cloudy tonight,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers and thunderstorms Tuesday afternoon, partly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, mostly cloudy late Tuesday night,
• Partly cloudy and a bit cooler Wednesday with a slight (20%) chance of afternoon showers, a (30%) chance of evening showers, then just a slight (20%) chance of showers late Wednesday night.
• free air freezing level 14,000 ft. today and tonight, snow level above 8,000 ft. Tuesday through Wednesday night.
• highs 76-62 lows 45-42.
• A mix of clouds and sun with a slight (20%) chance of showers Thursday, partly cloudy with a slight (20%) chance of showers at night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Friday night through Saturday evening,  just partly cloudy late Saturday night,
• Mostly sunny Sunday AM, then partly cloudy and a bit warmer Sunday afternoon.
• snow level above 8,000 ft. Thursday through Saturday night, then free air freezing level 10,000 ft Sunday.
• highs 62-60 warming to 64 Saturday cooling to 60 Sunday lows 42-37 warming to 40 Saturday night.

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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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