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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The upper level airflow is sending cooler air our way and continuing our rain chances. A frontal system will move in bringing even more rain.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 22 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 28 in the Good category measuring Particulate Matter.

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

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Advisories:

• A HIGH WIND WARNING IS IN EFFECT UNTIL 7 PM TODAY FOR THE NORTH OREGON COAST AND THE COAST RANGE OF NORTHWEST OREGON.
• A HIGH SURF ADVISORY IS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR THE NORTH OREGON COAST.
• 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:

• Cloudy with rain this evening, showers late tonight (0.50 in. of rain possible) and breezy (Wind: SW 15-25 mph gusts to 35 mph decreasing to SW 10-15 late at night),
• Patchy AM fog, cloudy and a bit cooler with a slight (20%) chance of showers Wednesday (under 0.10 in. of rain possible), a good (50%) chance of evening rain, rain late Wednesday night (0.75 in. of rain possible),
• Rain Thursday, possibly heavy at times in the AM, a (%) chance of evening rain, patchy fog with a slight (20%) chance of showers late at night,
• Patchy AM fog, a mix of clouds and sun and a bit cooler Friday, then mostly cloudy with a (40%) chance of showers Friday night.
• lows 43-46 cooling to near 40 Friday night highs 53-55 cooling to near 50 Friday.
• Mostly cloudy with a slight (20%) chance of rain Saturday, partly cloudy Saturday night through Sunday night,
• A mix of clouds and sun Monday, mostly cloudy with a (30%) chance of rain Monday night,
• Then rain likely (60%) Tuesday.
• highs 53-46 lows 38-36 warming back to 38 Monday night. (seasonal averages high 52 low 38)

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Your Saturday College Football Forecast:

Ducks vs USC at Autzen Stadium – Kickoff 12:30 PM PST: Mostly cloudy with a slight chance of rain, 44 warming to near 50 by the end of the game.

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Beavers vs Washington at Reser Stadium – Kickoff 3:00 PM PST: Mostly cloudy with a slight chance of rain, becoming partly cloudy 52 cooling as the game progresses.

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Forecast for Roseburg:

• Cloudy with rain tonight (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler with a slight (20%) chance of AM showers Wednesday, just mostly cloudy in the afternoon, cloudy with a slight (20%) chance of evening rain, rain late at night,
• Mostly cloudy with AM showers, rain Thursday afternoon, a (40%) chance of rain in the evening, a slight (20%) chance of showers late Thursday night,
• Mostly cloudy with a slight (20%) chance of showers Friday, then a slight (20%) chance of rain Friday night.
• lows near 45 highs 56-58.
• Patchy AM fog, partly cloudy with a (30%) chance of showers Saturday afternoon, partly cloudy with patchy fog Saturday and Sunday, mostly clear Sunday night,
• Mostly cloudy with a slight (20%) chance of rain Monday, a (30%) chance of rain at night,
• Then showers likely (60%) Tuesday.
• highs 57-50 lows 43-39 warming to 42 Monday night. (seasonal averages high 53 low 40)

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

• Mostly cloudy with rain this evening, a good (50%) chance of coastal rain late while rain likely (70%) inland late tonight (0.25 in. of rain possible) and breezy (Wind: SW 15-25 mph decreasing to SW 5-10 late at night),
• Mostly cloudy and a bit cooler Wednesday with a slight (20%) chance of AM showers, cloudy with a slight (20%) chance of evening rain, rain late Wednesday night,
• Mostly cloudy with AM showers, rain Thursday afternoon,  a (30%) chance of evening coastal rain while a (30%) chance of evening inland rain, a slight (20%) chance of showers late Thursday night,
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Friday afternoon, then a (30%) chance of rain Friday night.
• lows 48-46 highs 56-60.
• Patchy AM fog, partly cloudy a with a (30%) chance of showers Saturday afternoon, partly cloudy with patchy fog Saturday night and Sunday, mostly clear Sunday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Monday, a (40%) chance of rain at night,
• Then showers likely (60%) and cooler Tuesday.
• highs 58-53 lows near 45. (seasonal averages high 55 low 43).

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Forecast for the Cascades in Lane County:

• Cloudy with rain this evening, rain or snow late tonight (0.75 in. of rain possible, 2-4 in. of snow possible),
• Mostly cloudy with AM showers likely (70%),  a slight (20%) chance of showers Wednesday afternoon (under 0.10 in. of rain possible, 1 in. of snow possible), cloudy with a good (50%) chance of evening rain or snow, rain or snow late at night (1 in. of rain possible, 2-5 in. of snow possible),
• Mostly cloudy with rain and a bit warmer Thursday, a good (50%) chance of rain in the evening, a good (50%) chance of showers late Thursday night,
• A slight (20%) chance of showers Friday AM, a mix of clouds and sun in the afternoon, partly cloudy with a (40%) chance of rain or snow Friday night.
• snow level 7,000 ft. falling to 5,000 ft. late tonight, 4,000 ft. Wednesday, 4,500 ft. rising to 6,000 ft. late Wednesday night, 7,000 ft. Thursday, 6,000 ft. Thursday night, 5,000 ft. Friday, then 6,000 ft. Friday night.
• lows 32-27 highs 35-37 cooling back to 35 Friday.
• Mostly cloudy with a slight (20%) chance of rain and a bit warmer Saturday, partly cloudy Saturday night through Sunday night,
• A mix of clouds and sun and cooler Monday, mostly cloudy with a (40%) chance of rain or snow at night,
• Then rain or snow likely (60%) and cooler Tuesday.
• snow level 5,000 ft. Friday, 6,000 ft. Friday night, 7,000 ft. Saturday, Free air freezing level 9,000 ft. Saturday night, 10,000 ft. Sunday, 6,000 ft. Sunday night, 9,000 ft. Monday, snow level 5,500 ft. Monday night, then 5,000 ft. Tuesday.
• highs 43-45 cooling to 38 Monday lows near 30.

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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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