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 moved through the Pacific Northwest bringing showers through early Thursday. Upper level high pressure is taking over clearing the sky and cooling us down. Another in a series of frontal systems will roll in starting Sunday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 43 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 39 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 sunny and cooler this afternoon, partly cloudy with patchy fog again late tonight,
• Patchy AM fog, mostly sunny Saturday and Sunday, mostly clear Saturday night and partly cloudy Sunday night with patchy fog late late both nights,
• highs 52-50 warming back to 52 Sunday lows 32-30 warming to 36 Sunday night.
• A mix of clouds and sun with a slight (20%) chance of showers Monday, a (30%) chance of afternoon showers, becoming mostly cloudy with showers likely (70%) Monday night and Tuesday (cooler), a (40%) chance of rain and snow showers at night (snow level 1,000 ft.),
• 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 this afternoon, partly cloudy this evening, mostly clear with patchy fog late tonight,
• 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.
• highs 56-53 warming to 55 unday lows 37-35 warming to 40 Sunday night.
• 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%) and colder 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 53-38 lows 39-30. (seasonal averages high 52 low 40)

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

• Partly cloudy this afternoon and evening, mostly clear tonight,
• Partly cloudy with 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.
• highs near 60 lows 42-44.
• 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:

• Mostly sunny this afternoon, partly cloudy tonight,
• Sunny and just a bit warmer Saturday, clear Saturday night,
• Mostly sunny and a bit warmer Sunday, then partly cloudy Sunday night.
• free air freezing level 7,500 ft. today, 8,000ft. tonight, then 9,000 ft. Saturday, 10,000 ft. Saturday night, 11,000 ft. Sunday, then 10,000 ft. Sunday night.
• highs 40-49 lows 25-32.
• Partly cloudy with a slight (20%) chance of showers 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 mostly sunny Thursday (Thanksgiving Day).
• snow level 5,500 ft. Monday, 3,500 ft. Monday night, at the surface Tuesday through Wednesday night, then free air freezing level at the surface Thursday.
• 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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