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 chances of precipitation. A frontal system is on its way bringing the slight chance of drizzle at night. By Thursday the 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. So far it does look like sunshine and warming temperatures for the holiday weekend.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 20 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 20 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 FROM 2 PM UNTIL 8 PM TODAY FOR STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST INCLUDING THE BLM LAND IN EASTERN LAKE COUNTY, WESTERN HARNEY COUNTY, THE BURNS BLM, THE VALE BLM 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:

• Partly cloudy and a bit cooler this afternoon, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler Wednesday with a good (50%) chance of showers (under 0.10 in. of rain possible), a (40%) chance of evening showers, a slight (20%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Thursday afternoon, then mostly cloudy with a good (50%) chance of rain Thursday night.
• highs 76-72 lows 53-50.
• A mix of clouds and sun and a bit cooler with a (40%) chance of AM 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 warmer Saturday, then partly cloudy and a bit warmer Saturday night through Monday (Labor Day).
• highs 72-79 lows near 50. (seasonal averages high 81 low 50)

 

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Forecast for Roseburg:

• Partly cloudy and a bit cooler this afternoon and tonight,
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Wednesday (under 0.10 in. of rain possible) and in the evening, just mostly cloudy late Wednesday night (under 0.10 in. of rain possible),
• Partly cloudy Thursday AM, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon, mostly cloudy with a (30%) chance of showers late Thursday night.
• highs 80-77 lows 52-54.
• Mostly cloudy with a sight (20%) of showers Friday, partly cloudy with a slight (20%) chance of evening showers, then just partly cloudy and a bit warmer Saturday through Monday (Labor Day).
• highs 76-84 lows near 52. (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 with a slight (20%) chance of coastal showers , partly cloudy this evening, mostly cloudy with a sight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with a (30%) chance of showers Wednesday (under 0.10 in. of rain possible), a slight (20%) chance of evening coastal showers while a slight (20%) chance of inland showers in the evening, mostly cloudy late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of coastal showers Thursday afternoon while partly cloudy inland in the AM and mostly cloudy in the afternoon with a slight (20%) chance of showers and a bit cooler, then mostly cloudy with a (30%) chance of showers Thursday night.
• highs 68-65 lows 55-53.
• Mostly cloudy with a (30%) chance of AM showers, a (30%) chance of showers Friday, a slight (20%) chance of evening showers, just mostly cloudy Friday night,
• Then partly cloudy Saturday  through Monday (Labor Day).
• highs 65-67 lows near 52. (seasonal averages high 66 low 52)

 

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Forecast for the Cascades in Lane County:

• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers this afternoon and evening, just partly cloudy late tonight,
• Partly cloudy and a bit cooler Wednesday with a slight (20%) chance of afternoon showers, a (40%) chance of evening showers,  just a slight (20%) chance of showers late Wednesday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of rain Thursday afternoon, then partly cloudy with a (40%) chance of rain at night.
• snow level above 8,000 ft. today through Thursday night.
• highs 68-60 lows 44-37.
• A mix of clouds and sun and a bit warmer with a (40%) chance of AM rain, a slight (20%) chance of showers Friday afternoon, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Friday  night through Sunday night,
• Then partly cloudy with a slight (20%) chance of showers Monday afternoon (Labor Day).
• snow level above 7,000 ft. Friday and Friday night, free air freezing level 7,500 ft. Saturday, 9,000 ft. Saturday night, 10,000 ft. Sunday, 12,000 ft. Sunday night, then snow level above 8,000 ft. Monday.
• highs 55-66 lows 37-40.

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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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