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 25 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 19 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 TODAY 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:

• Rain this AM, a slight (20%) chance of showers this afternoon (0.10 in. of rain possible), a slight (20%) chance of isolated evening showers, partly cloudy with patchy fog late tonight and Friday AM, mostly sunny in the afternoon, partly cloudy with patchy fog again late Friday night,
• Partly cloudy with patchy AM fog, mostly sunny Saturday, then mostly clear late Saturday night.
• highs 56-48 lows 38-32.
• Partly cloudy Sunday and Sunday night,
• Partly cloudy with a slight (20%) chance of showers Monday AM, mostly cloudy with a (40%) chance of showers in the afternoon, showers likely (70%) Monday night,
• Cloudy with a good (50%) chance of showers and cooler Tuesday, a (30%) chance of rain and snow showers at night,
• Then mostly cloudy with a (40%) chance of rain and snow showers Wednesday.
• highs 50-40 lows 32-37 cooling back to 32 Tuesday night. (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 rain today (0.50 in. of rain possible), a (40%) chance of rain this evening, a slight (20%) chance of showers late tonight,
• Mostly cloudy Friday AM, partly cloudy in the afternoon and Friday night,
• Mostly cloudy with patchy AM fog, sunny but cooler Saturday afternoon, then mostly clear with patchy fog late Saturday night.
• highs 57-50 lows 42-34.
• Patchy AM fog, partly cloudy Sunday, mostly clear Sunday night,
• Mostly cloudy with a slight (20%) chance of rain Monday, rain likely (60%) at night,
• Mostly cloudy with rain and snow showers likely (70%) and cooler Tuesday, then mostly cloudy with a (40%) chance of rain and snow showers Tuesday night and Wednesday.
• highs 50-53 cooling to 40 Wednesday 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:

• Rain today (0.60 in. of rain possible), a (30%) chance of evening rain, just mostly cloudy late tonight and Friday AM with patchy fog, partly cloudy in the afternoon and Friday night,
• Patchy AM fog, partly cloudy Saturday, then mostly clear with patchy fog late Saturday night.
• highs near 58 lows 43-40.
• Patchy AM fog, partly cloudy Sunday, mostly clear Sunday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Monday, rain likely (70%) at night,
• Mostly cloudy with showers likely (70%) and cooler Tuesday, a (40%) chance of showers Tuesday night,
• Mostly cloudy with a (40%) chance of rain and snow showers and a bit cooler Wednesday.
• highs 57-45 lows 43-38. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Rain this AM, showers this afternoon (0.75 in. of rain possible), a good (50%) chance of scattered showers this evening, a slight (20%) chance of showers late tonight (0.10 in. of rain possible),
• Partly cloudy in the AM, mostly sunny Friday afternoon, partly cloudy at night,
• Mostly sunny Saturday, then mostly clear Saturday night.
• snow level 8,000 ft. today, 7,500 ft. falling to 6,500 ft. tonight, free air freezing level 7,500 ft. Friday and Friday night, then 9,000 ft. Saturday and Saturday night.
• highs 46-40 warming to 44 Saturday lows 30-24.
•  Mostly sunny Sunday, partly cloudy Sunday night,
• Partly cloudy Monday AM, mostly cloudy and cooler with a slight (20%) chance of rain and snow showers in the afternoon, mostly cloudy with rain  and snow showers late at night,
• Snow showers likely (60%) and much colder Tuesday, mostly cloudy with a (40%) chance of snow showers at night,
• Then a mix of clouds and sun with a (40%) chance of snow showers Wednesday.
• free air freezing level 10,000 ft. Sunday, 8,000 ft. Sunday night, free air freezing level 6,000 ft. in the AM, snow level 4,500 ft. Monday, 2,500 ft. Monday night night and Tuesday, then at the surface Tuesday night and Wednesday.
• highs 46-25 lows 26-16.

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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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