Here is my weekly weather quiz question. What is “coalescence?” 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. The answer has to be a comment to win. An email answer will not count. Good luck.

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A frontal system is moving through the Pacific Northwest keeping the slight chance of showers with us this afternoon. Upper level high pressure is going to take over clearing the sky and cooling us down. Another in a series of frontal systems will roll in Sunday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A WIND ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR NORTHERN AND EASTERN KLAMATH COUNTY,  AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY,
• A HEALTH ADVISORY CONTINUES FOR SUNSET BAY STATE PARK BEACH LOCATED IN COOS COUNTY FOR HIGHER-THAN-NORMAL FECAL BACTERIA WHICH CAN RESULT IN DIARRHEA, STOMACH CRAMPS, SKIN RASHES, UPPER RESPIRATORY INFECTIONS AND OTHER ILLNESSES. DIRECT CONTACT WITH THE WATER – ESPECIALLY BY CHILDREN AND THE ELDERLY, WHO MAY BE VULNERABLE TO WATERBORNE BACTERIA – SHOULD BE AVOIDED IN THIS AREA UNTIL THE ADVISORY IS LIFTED. VISITORS SHOULD AVOID WADING IN NEARBY CREEKS, POOLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.

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

• Mostly cloudy this evening, partly cloudy with patchy fog late tonight and Friday AM, partly cloudy in the afternoon, mostly clear with patchy fog again late Friday night,
• Patchy AM fog, mostly sunny Saturday and Sunday, mostly clear Saturday night and partly cloudy Sunday night with patchy fog late late both nights,
• lows 38-30 warming to 36 Sunday night highs 52-50 warming back to 52 Sunday.
• A mix of clouds and sun with a slight (20%) chance of showers Monday, becoming mostly cloudy with showers likely (70%) Monday night and Tuesday (cooler), a (40%) chance of rain and snow showers at night,
• Partly cloudy and cooler with a slight (20%) chance of rain and snow showers Wednesday, just partly cloudy Wednesday night,
• Then mostly sunny Thursday (Thanksgiving Day).
• highs 52-40 lows 38-26. (seasonal averages high 51 low 37)

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Your Saturday College Football Forecast:

Ducks vs USC at Autzen Stadium – Kickoff 12:30 PM PST: Mostly sunny, 44 warming to near 50 by the end of the game, wind N 5-10 mph.

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Beavers vs Washington at Reser Stadium – Kickoff 3:00 PM PST: Mostly sunny then becoming partly cloudy, near 50 cooling as the game progresses , wind N 5-10 mph diminishing late.

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Forecast for Roseburg:

• Mostly cloudy with a (40%) chance of showers this evening, partly cloudy with patchy fog late tonight,
• Mostly cloudy with areas of fog Friday AM, sunny in the afternoon, mostly clear with patchy fog late Friday night,
• Partly cloudy with patchy AM fog, sunny but cooler Saturday afternoon, mostly clear with patchy fog late Saturday night,
• Patchy AM fog, partly cloudy Sunday afternoon, then mostly clear Sunday night.
• lows 45-35 warming to 40 Sunday night highs 53-56.
• Partly cloudy with a slight (20%) chance of rain Monday, mostly cloudy with rain at night,
• Mostly cloudy with rain and snow showers and much cooler Tuesday, rain and snow showers likely (60%) Tuesday night,
• A (30%) chance of rain and snow showers and a bit cooler Wednesday, just partly cloudy Wednesday night,
• Then sunny and just a bit cooler Thursday (Thanksgiving Day).
• highs 55-39 lows 38-30. (seasonal averages high 52 low 40)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Mostly cloudy with a slight (20%) chance of evening showers, partly cloudy with patchy fog late tonight and Friday AM, sunny in the afternoon, mostly clear Friday night,
• Patchy AM fog, sunny Saturday afternoon, mostly clear with patchy fog late Saturday night,
• Partly cloudy with patchy AM fog, sunny Sunday, then mostly clear Sunday night.
• lows 47-42 warming to 44 Sunday night highs near 60.
• Partly cloudy and a bit cooler with a slight (20%) chance of rain Monday, mostly cloudy with rain at night,
• Mostly cloudy with showers likely (70%) and cooler Tuesday and Tuesday night,
• Mostly cloudy with a (30%) chance of rain and snow showers and a bit cooler Wednesday, just partly cloudy at night,
• Then sunny Thursday (Thanksgiving Day).
• highs 55-46 lows 42-34. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Cloudy with a good (50%) chance of scattered showers this evening (0.10 in. of rain possible), partly cloudy late tonight ,
• Mostly sunny Friday, clear at night,
• Mostly sunny and just a bit warmer Saturday, clear Saturday night,
• Mostly sunny and a bit warmer Sunday, then partly cloudy Sunday night.
• snow level 7,500 ft. this evening, free air freezing level 7,500 ft. Friday, 8,000ft. Friday night, then 9,000 ft. Saturday, 10,000 ft. Saturday night, 11,000 ft. Sunday, then 10,000 ft. Sunday night.
• lows 30-25 warming to 32 Sunday night highs 40-49.
• Partly cloudy with a slight (20%) chance of AM showers, a slight (20%) chance of rain and snow showers and cooler Monday afternoon, mostly cloudy with rain and snow showers likely (70%) late at night,
• Snow showers likely (60%) and much colder Tuesday, mostly cloudy with a good (50%) chance of snow showers Tuesday night,
• Partly cloudy with a (40%) chance of snow showers Wednesday, partly cloudy with a slight (20%) chance of snow showers at night,
• Then just partly cloudy Thursday (Thanksgiving Day).
• snow level 6,000 ft.Monday, 5,000 ft. falling to 3,500 ft. Monday night night and Tuesday, then at the surface Tuesday night and Wednesday.
• highs 40-25 lows 25-12.

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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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