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 21 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 19 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 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 9 PM TUESDAY 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:

• Partly cloudy this evening, becoming mostly cloudy late tonight,
• Cloudy Tuesday AM, partly cloudy and a bit cooler in the afternoon, a slight (20%) chance of showers late Tuesday night (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 (30%) chance of evening showers, a slight (20%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• A mix of clouds and sun and a bit cooler with a (30%) chance of showers Thursday afternoon, then mostly cloudy with a (30%) chance of showers Thursday night.
• lows 55-50 highs 78-72.
• A mix of clouds and sun and a bit cooler with a slight (20%) 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 74-79 lows 50-53. (seasonal averages high 81 low 50)

 

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Forecast for Roseburg:

• Partly cloudy 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 (30%) chance of showers and a bit cooler Wednesday (under 0.10 in. of rain possible), partly cloudy in the evening with a slight (20%) chance of showers, mostly cloudy late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy Thursday AM, partly cloudy and a bit cooler with a (30%) chance of showers in the afternoon, partly cloudy with a (30%) of showers in the evening, then mostly cloudy with a (30%) chance of showers late Thursday night.
• lows 55-53 highs 79-75.
• Mostly cloudy with a sight (20%) of showers Friday and in the evening, just mostly cloudy at night and Saturday AM, then partly cloudy and a bit warmer Saturday afternoon through Monday (Labor Day).
• highs 76-82 lows near 53. (seasonal averages high 83 low 54)

 

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

• Mostly cloudy with patchy fog late tonight, areas of coastal drizzle late,
• Mostly cloudy with patchy AM fog, partly cloudy and a bit warmer Tuesday afternoon with a slight (20%) chance of coastal showers , a slight (20%) chance of coastal showers at night while partly cloudy in the evening inland and mostly cloudy with a sight (20%) chance of showers inland late Tuesday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with a good (50%) chance of showers Wednesday (under 0.10 in. of rain possible), a slight (20%)  chance of evening coastal showers while partly cloudy with a (30%) chance of inland showers in the evening, mostly cloudy late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy in the AM, partly cloudy with a (30%) chance of showers and a bit cooler Thursday afternoon, partly cloudy with a (30%) chance of evening showers, then mostly cloudy with a (30%) chance of showers late Thursday night.
• lows 53-55 cooling back to 53 Thursday night highs 68-66.
• Mostly cloudy with a slight (20%) chance of showers Friday through Saturday AM, then partly cloudy Saturday afternoon through Monday (Labor Day).
• highs near 66 lows near 53. (seasonal averages high 66 low 52)

 

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Forecast for the Cascades in Lane County:

• 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 clear late Tuesday night,
• Partly cloudy and a bit cooler Wednesday with a slight (20%) chance of afternoon showers, a (30%) 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 showers Thursday afternoon, then partly cloudy with a slight (20%) chance of showers at night.
• free air freezing level 14,000 ft. tonight, snow level above 8,000 ft. Tuesday through Thursday night.
• lows 46-37 highs 68-60.
• A mix of clouds and sun and a bit warmer 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 Friday night, just partly cloudy and a bit warmer Saturday through late 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 63-66 lows 37-46.

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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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