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 14 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 53 in the Moderate category measuring Particulate Matter.

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

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

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Advisories:

• A FLOOD WATCH IS IN EFFECT FOR POSSIBLE MINOR FLOODING FROM THIS EVENING THROUGH THURSDAY MORNING FOR THE NORTH OREGON COAST, THE CENTRAL OREGON COAST, THE CENTRAL COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE GREATER PORTLAND AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, AND THE NORTHERN OREGON CASCADE FOOTHILLS.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 8 PM TONIGHT UNTIL NOON THURSDAY FOR THE NORTH OREGON CASCADES NOT INCLUDING THE CASCADES IN LANE 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:

• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers today (under 0.10 in. of rain possible), rain, possibly heavy at times, tonight (0.75 in. of rain possible),
• Rain Thursday (0.50 in. of rain possible), possibly heavy at times in the AM, a slight (20%) chance of evening showers, patchy fog late at night,
• Patchy AM fog, a mix of clouds and sun and a bit cooler Friday, then mostly cloudy Friday night.
• highs 53-55 cooling to near 50 Friday lows 46-40.
• Partly cloudy Saturday through Sunday night,
• A mix of clouds and sun Monday, mostly cloudy with a (40%) 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 51 low 37)

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Your Saturday College Football Forecast:

Ducks vs USC at Autzen Stadium – Kickoff 12:30 PM PST: Partly cloudy 44 warming to near 52 by the end of the game.

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Beavers vs Washington at Reser Stadium – Kickoff 3:00 PM PST: Partly cloudy, 52 cooling a bit as the game progresses.

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Forecast for Roseburg:

• Mostly cloudy and a bit cooler with a slight (20%) chance of isolated showers today, cloudy with a slight (20%) chance of evening rain, rain late tonight,
• Mostly cloudy with rain Thursday, a (40%) chance of rain in the evening, a slight (20%) chance of showers late Thursday night,
• Just mostly cloudy Friday, then a slight (20%) chance of showers Friday night.
• highs 55-58 lows 49-44.
• Mostly cloudy with a slight (20%) chance of showers Saturday, partly cloudy with patchy fog Saturday night and Sunday, mostly clear Sunday night,
• Mostly cloudy with a slight (20%) chance of rain Monday, a (30%) chance of rain at night,
• Then rain likely (60%) Tuesday AM, rain and snow showers likely (70%) in the afternoon.
• highs 56-48 lows 42-39 warming back to 42 Monday night. (seasonal averages high 52 low 40)

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

• Mostly cloudy and a bit cooler today with a slight (20%) chance of isolated AM coastal showers, cloudy with a slight (20%) chance of evening rain, rain late tonight,
• Mostly cloudy with rain Thursday, a slight (20%) chance of evening coastal rain while a (30%) chance of evening inland rain, a slight (20%) chance of showers late Thursday night,
• Just mostly cloudy Friday, then mostly cloudy with a slight (20%) chance of showers Friday night.
• highs 55-58 lows 52-46.
• Mostly cloudy a with a slight (20%) chance of showers Saturday, 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,
• Mostly cloudy with AM rain likely (60%), showers likely (70%) and cooler Tuesday afternoon.
• highs 58-53 lows 43-45. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a slight (20%) chance of rain and snow showers this afternoon (under 0.10 in. of rain possible), cloudy with rain and snow tonight (0.75 in. of rain possible, 3-5 in. of snow possible),
• Mostly cloudy with rain and a bit warmer Thursday (1 in. of rain possible), a good (50%) chance of rain in the evening, a slight (20%) chance of showers late Thursday night,
• A mix of clouds and sun Friday, mostly cloudy in the evening, just partly cloudy Friday night.
• snow level 4,000 ft. today, 4,000 ft. rising to 5,500 ft. late tonight, 7,500 ft. Thursday, 6,500 ft. Thursday night, 7,000 ft. Friday, then 8,000 ft. Friday night.
• highs 35-40 lows near 30.
• Partly cloudy Saturday through Sunday night,
• A mix of clouds and sun and cooler Monday, mostly cloudy with a (40%) chance of rain and snow at night,
• Then rain and snow likely (60%) and cooler Tuesday.
• snow level 9,000 ft. Saturday and Saturday night, 10,000 ft. Sunday, 9,000 ft. Sunday night and Monday, snow level 5,500 ft. Monday night, then 5,000 ft. Tuesday.
• highs 45-38 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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