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.

________________

The upper level airflow is sending cool moist air our way and continuing our rain chances. We are on the back side of a cold front. That’s why we dried a bit this afternoon. Low pressure moves closer and strengthens returning the rain. More frontal systems like this one on Sunday will continue our wet weather.

_______________

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).

________________

Advisories:

• A WIND ADVISORY IS IN EFFECT FROM 10 AM UNTIL 10 PM THURSDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY,  AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY,
• 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.

________________

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly cloudy with rain, possibly heavy at times, late tonight (1.00 in. of rain possible),
• Rain Thursday AM, showers in the afternoon (0.50 in. of rain possible), a slight (20%) chance of evening showers, partly cloudy with patchy fog late at night 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 partly cloudy with patchy fog late Saturday night.
• lows 45-32 highs 54-50.
• Partly cloudy Sunday and Sunday night,
• A mix of clouds and sun with a slight (20%) chance of rain Monday, mostly cloudy with a (40%) chance of showers Monday night,
• A good (50%) chance of showers and cooler Tuesday, a (30%) chance of showers at night,
• Then mostly cloudy with a (40%) chance of rain and snow showers Wednesday.
• highs 52-42 lows 32-37 cooling back to 32 Tuesday night. (seasonal averages high 51 low 37)

_____

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.

_____

Beavers vs Washington at Reser Stadium – Kickoff 3:00 PM PST: Mostly sunny then becoming partly cloudy, 50 cooling a bit as the game progresses.

_____________________

Forecast for Roseburg:

• Mostly cloudy with a (40%) chance of evening rain, rain late tonight and Thursday, a (40%) chance of rain in the evening, a slight (20%) chance of showers late Thursday night,
• 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.
• lows 46-34 highs 57-49.
• 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 49-53 cooling to 42 Wednesday lows 40-35. (seasonal averages high 52 low 40)

________________

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

• Cloudy with a (30%) chance of evening rain, rain late tonight at the shore while inland rain likely (60%) late tonight,
• Rain Thursday, a (30%) chance of evening rain, just mostly cloudy late Thursday night and Friday AM, partly cloudy in the afternoon and Friday night,
• Patchy AM fog, partly cloudy Saturday, then mostly clear with patchy fog late Saturday night.
• lows 50-43 warming to 45 Friday night cooling to near 40 Saturday night highs near 58.
• 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 45-39. (seasonal averages high 54 low 42).

________________

Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow likely (70%) this evening, rain and snow late tonight (1.00 in. of rain possible, 3-6 in. of snow possible),
• Rain Thursday (1 in. of rain possible), a good (50%) chance of showers in the evening, a slight (20%) chance of showers late Thursday night (0.10 in. of rain possible),
• Partly cloudy in the AM, mostly sunny Friday afternoon, partly cloudy at night,
• Mostly sunny Saturday, then partly cloudy Saturday night.
• snow level 4,000 ft. rising to 5,500 ft. late tonight, 8,500 ft. Thursday, 7,500 ft. falling to 6,500 ft. Thursday night, free air freezing level 7,500 ft. Friday, 9,000 ft. Friday night and Saturday, then 8,000 ft. Saturday night.
• lows 32-24 highs 42-45.
•  Mostly sunny Sunday, partly cloudy Sunday night,
• A mix of clouds and sun and cooler with a slight (20%) chance of rain and snow Monday, mostly cloudy with a good (50%) chance of snow showers at night,
• Snow showers likely (60%) and much colder Tuesday, mostly cloudy with a (40%) chance of snow showers at night,
• Then a good (50%) chance of snow showers Wednesday.
• free air freezing level 10,000 ft. Sunday and Sunday night, snow level 4,000 ft. Monday, 2,500 ft. Monday night night and Tuesday, then at the surface Tuesday night and Wednesday.
• highs 46-40 cooling to 26 Tuesday and Wednesday lows 22-26.

________________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________