Here is my weekly weather quiz question for the last time. What is “coalescence?” Here is the correct answer. Coalescence is the process by which water droplets in a cloud collide and come together to form raindrops. I’ll have a new weekly weather quiz question for you starting Monday. 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 moved through the Pacific Northwest bringing showers through early Thursday. Upper level high pressure has taken over clearing the sky and cooling us down. A frontal system will roll in starting Monday and that should get the precipitation falling again.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 33 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 11 in the Good category measuring Particulate Matter.

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

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

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Advisories:

• 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 with patchy AM fog, mostly sunny this afternoon and Sunday, mostly clear tonight with patchy fog late late and partly cloudy Sunday night,
• Mostly cloudy with a slight (20%) chance of AM showers, a bit warmer with a good (50%) chance of showers Monday afternoon, then showers Monday night.
• highs 48-45 warming to 52 Monday lows 28-38.
• Mostly cloudy and colder with showers likely (70%) Tuesday (snow level 1,500 ft.), a slight (20%) chance of evening showers, partly cloudy at night,
• Mostly sunny Wednesday, just clear Wednesday night,
• Sunny Thursday (Thanksgiving Day), clear at night,
• Then mostly sunny Friday.
• highs near 42 lows near 26. (seasonal averages high 50 low 37)

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Your Saturday College Football Forecast:

Ducks vs USC at Autzen Stadium – Kickoff 12:30 PM PST: Mostly sunny, 42 warming to near 48 by the end of the game, wind NE 5-10 mph. Dress accordingly because it will be quite cool.

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Beavers vs Washington at Reser Stadium – Kickoff 3:00 PM PST: Mostly sunny then mostly clear, near 48 cooling as the game progresses , wind NE 5-10 mph diminishing late. Dress accordingly because it will be quite cool.

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Forecast for Roseburg:

• Partly cloudy with patchy fog this AM, sunny and a bit warmer this afternoon, mostly clear with patchy fog late tonight,
• Patchy AM fog, partly cloudy and a bit warmer Sunday afternoon, partly cloudy with a slight (20%) chance of rain and drizzle late Sunday night,
• Mostly cloudy with a (30%) chance of rain Monday, evening showers, then rain and snow showers likely (70%) and colder Monday night.
• highs 55-58 cooling back to 55 Monday lows 35-40.
• Mostly cloudy with rain and snow showers and colder Tuesday, a good (50%) chance of rain and snow showers and colder Tuesday night,
• Partly cloudy and a bit cooler Wednesday, mostly clear Wednesday night,
• Mostly sunny and just a bit cooler Thursday (Thanksgiving Day) and Friday, mostly clear Thursday night.
• highs 53-38 lows 39-30. (seasonal averages high 51 low 40)

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

• Partly cloudy with patchy AM fog, sunny this afternoon, mostly clear with patchy fog late tonight,
• Partly cloudy Sunday with patchy AM fog, partly cloudy in the afternoon and evening, mostly cloudy with a slight (20%) chance of patchy coastal drizzle at night while a slight (20%) chance of patchy drizzle late Sunday night,
• Partly cloudy with a slight (20%) chance of rain Monday, evening showers, then showers likely (70%) late Monday night.
• highs 59-62 cooling to 55 Monday lows 42-45 cooling back to 42 Monday night.
• Mostly cloudy with AM showers, rain and snow showers likely (70%) and cooler Tuesday afternoon, a (40%) chance of rain and snow showers Tuesday night,
• Partly cloudy Wednesday, mostly clear at night,
• Then mostly sunny Thursday (Thanksgiving Day) and Friday, mostly clear Thursday night.
• highs 46-48 lows 35-32 warming back to 35 Friday. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Sunny and just a bit warmer today and Sunday, clear tonight, partly cloudy Sunday night,
• Partly cloudy in the AM, mostly cloudy with a (40%) chance of showers and a bit cooler Monday afternoon, showers Monday night.
• free air freezing level 10,000 ft. today, 11,000 ft. tonight, 10,000 ft. Sunday, 9,000 ft. Sunday night, 7,000 ft. Monday AM, snow level 8,000 ft. falling to 5,00 ft. Monday afternoon, then 4,500 ft. falling to 2,000 ft. Monday night.
• highs 43-48 cooling back to 43 Monday lows 30-32 cooling to 25 Monday night.
• Mostly cloudy with snow showers and much colder Tuesday, a good (50%) chance of snow showers Tuesday night,
• Partly cloudy with a slight (20%) chance of snow showers Wednesday, mostly clear at night,
• Then mostly sunny and a bit warmer Thursday (Thanksgiving Day) and Friday, mostly clear Thursday night.
• snow level at the surface Tuesday through Wednesday, free air freezing level at the surface Wednesday night and Thursday, 5,000 ft. Thursday night, then 4,500 ft. Friday.
• highs 25-30 lows 16-12 warming to 17 Thursday 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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