Here is my new weekly weather quiz question. What is “Deep Percolation Loss?”  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 Jet Stream is swinging the air in from the southwest and west which will increase the moisture that’s headed our way. A frontal system pushed through the Pacific Northwest cooling us down and bringing at least a slight chance of precipitation. The Autumnal Equinox which begins the Fall or Autumn season occurs at 1:21 AM Wednesday. You may see it published on calendars etc. that it is actually on Tuesday, but that would be because they are using Eastern Daylight Time which is 2 hours later than the our Pacific Time Zone. Another in a series of frontal systems will move in by the end of the week.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 33 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 9 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 31 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.
• A HEALTH ADVISORY CONTINUES FOR UPPER KLAMATH LAKE AND AGENCY LAKE DOWN TO KENO DAM, LOCATED JUST NORTH OF KLAMATH FALLS ALONG HIGHWAY 97 IN KLAMATH COUNTY. WATER MONITORING BY THE USGS HAS CONFIRMED THE PRESENCE OF BLUE-GREEN ALGAE TOXINS WHICH CAN BE HARMFUL TO HUMANS AND ANIMALS. SWALLOWING, INHALING OR SKIN CONTACT WITH WATER DROPLETS SHOULD BE AVOIDED.

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

• Partly cloudy with patchy AM fog, mostly sunny and a just bit cooler this afternoon, mostly clear tonight,
• Mostly sunny Wednesday AM, partly cloudy and warmer in the afternoon and Wednesday night,
• Partly cloudy and warmer Thursday, mostly cloudy with a slight (20%) chance of evening rain, then mostly cloudy and warmer with a (40%) chance of rain late Thursday night.
• highs 72-79 lows 45-57.
• Mostly cloudy with a (40%) chance of rain Friday AM, a (40%) chance of showers and cooler in the afternoon and evening, partly cloudy late Friday night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Saturday afternoon, partly cloudy with a slight (20%) chance of showers Saturday evening, just partly cloudy late Saturday night,
• Partly cloudy with a slight (20%) chance of showers Sunday afternoon, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers late Sunday night,
• Then a mix of clouds and sun with a slight (20%) chance of showers Monday.
• highs 73-68 lows 52-46 warming to 48 Sunday night. (seasonal averages high 75 low 46)

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Your College Football Forecasts:

Friday:

Beavers vs Stanford at Reser Stadium -Kickoff 7 PM PDT: Mostly cloudy with a 40% chance of showers 70 cooling through the 60s by the end of the game.

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Saturday:

Ducks vs Utah at Autzen Stadium – Kickoff 5:30 PM PDT: Partly cloudy with a slight chance of showers 68 and cooling as the game progresses.

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Forecast for the Umpqua Basin including Roseburg:

• Partly cloudy this AM, sunny this afternoon and Wednesday, mostly clear both nights,
• Partly cloudy Thursday, then mostly cloudy with  slight (20%) chance of rain Thursday night.
• highs 76-82 lows 45-54.
• Mostly cloudy with a slight (20%) chance of rain and cooler Friday, a slight (20%) chance of Friday night and Saturday night through Sunday night,
• Partly cloudy with a (30%) chance of showers Monday AM, then mostly cloudy with a slight (20%) chance of showers in the afternoon.
• highs 70-67 warming to 72 Monday lows 50-46 warming back to 50 Sunday night. (seasonal averages high 77 low 50)

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

• Partly cloudy and cooler this AM, sunny and a bit cooler this afternoon, mostly clear this evening, partly cloudy late tonight,
• Partly cloudy Wednesday AM, mostly sunny and a bit warmer in the afternoon, mostly clear in the evening, partly cloudy late Wednesday night and Thursday, then mostly cloudy with a (30%) chance of rain Thursday night.
• highs 63-65 lows 48-56.
• Mostly cloudy with a (30%) chance of rain Friday and in the evening, cooler with a slight (20%) chance of showers late at night,
• Partly cloudy with a slight (20%) chance of showers Saturday through Monday AM, partly cloudy with a slight (20%) chance of showers and a bit cooler Saturday night through Sunday night,
• Partly cloudy with a slight (20%) chance of showers Monday AM, then mostly cloudy and slightly cooler with a (30%) chance of showers in the afternoon.
• highs 64-60 lows 54-46 warming to 52 Sunday night. (seasonal averages high 64 low 49).

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit cooler today and Wednesday, mostly clear tonight, party cloudy Wednesday night,
• Partly cloudy and warmer Thursday and in the evening, then mostly cloudy with a slight (20%) chance of rain late Thursday night.
• free air freezing level 12,000 ft. today and tonight, 11,000 ft. Wednesday, 12,000 ft. Wednesday night and Thursday, then snow level above 8,000 ft. Thursday night.
• highs 64-62 warming to 66 Thursday lows 38-45.
• Mostly cloudy Friday with a slight (20%) chance of AM rain, a (40%) chance of showers and cooler in the afternoon and evening, partly cloudy with a slight (20%) chance of showers late Friday night,
• Partly cloudy with a slight (20%) chance of showers and cooler Saturday and in the evening, just partly cloudy late Saturday night,
• Partly cloudy with a slight (20%) chance of showers and just a bit cooler Sunday afternoon and at night,
• Then a mix of clouds and sun with a slight (20%) chance of showers and slightly cooler Monday.
• snow level above 8,000 ft. Friday through Saturday, 7,500 ft. Saturday night, 7,000 ft. Sunday, 7,500 ft. Sunday night, then 7,000 ft. Monday.
• highs 58-50 lows near 40-35.

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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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