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 is at 1:21 AM today. You may see it published on calendars etc. that it is actually at a different time today, 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 39 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 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 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:

• Mostly sunny with patchy AM fog and warmer this afternoon, partly cloudy tonight,
• A mix of clouds and sun and warmer Thursday, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late Thursday night,
• Mostly cloudy with a (40%) chance of AM rain, a (40%) chance of showers and cooler Friday afternoon, a slight (20%) chance of showers in the evening, then partly cloudy late Friday night.
• highs 76-80 cooling to 75 Friday lows 48-55 cooling to 52 Friday night.
• A mix of clouds and sun Saturday, partly cloudy at night,
• Partly cloudy with a slight (20%) chance of showers Sunday afternoon and  evening, mostly cloudy with a slight (20%) chance of showers late Sunday night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday AM, a (30%) chance of showers in the afternoon, then partly cloudy with a (30%) chance of showers Monday night and Tuesday (a bit warmer).
• highs 72-69 warming to back to 72 Tuesday lows 45-48. (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 slight chance of evening showers 66 cooling through the low 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 70 and cooling through the 60s as the game progresses.

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Forecast for the Umpqua Basin including Roseburg:

• Patchy AM fog, sunny this afternoon, mostly clear tonight,
• Partly cloudy Thursday and in the evening, mostly cloudy with  slight (20%) chance of rain Thursday night,
• Then mostly cloudy with a slight (20%) chance of showers and cooler Friday and Friday night.
• highs 80-82 cooling to 79 Friday lows 50-55 cooling back to 52 Friday night.
• Mostly cloudy with a slight (20%) chance of showers Saturday AM, partly cloudy with a slight (20%) chance of showers in the afternoon through Sunday night,
• Mostly cloudy with a (30%) chance of showers Monday through Tuesday.
• highs 75-70 warming to 73 Tuesday lows 46-43 warming to 47 Monday night. (seasonal averages high 77 low 50)

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

• Mostly cloudy with areas of fog this AM, partly cloudy this afternoon through Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night,
• Mostly cloudy with a (30%) chance of rain Friday AM, then mostly cloudy with a slight (20%) chance of showers in the afternoon and Friday night.
• highs near 66 lows 52-55 cooling back to 52 Friday night.
• Partly cloudy with a slight (20%) chance of showers Saturday through Sunday night,
• Then mostly cloudy with a slight (20%) chance of showers and a bit cooler Saturday night through Sunday night,
• Then mostly cloudy with a (30%) chance of showers Monday through Tuesday
• highs near 65 lows 48-52. (seasonal averages high 64 low 49).

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Forecast for the Cascades in Lane County:

• Mostly sunny today, partly cloudy tonight through Thursday night,
• Mostly cloudy with a slight (20%) chance of AM rain, a slight (20%) chance of showers and cooler in the afternoon, mostly cloudy with a slight (20%) chance of showers late Friday night.
• free air freezing level 11,000 ft. today, 12,000 ft. tonight and Thursday, then snow level above 8,000 ft. Thursday night through Friday night.
• highs 64-70 cooling back to 64 Friday lows 40-43 cooling to 39 Friday night.
• A mix of clouds and sun with a slight (20%) chance of showers and cooler Saturday and Sunday afternoon and at night, partly cloudy with a slight (20%) chance of showers both nights,
• Then a mix of clouds and sun with a (30%) chance of showers Monday and Tuesday, partly cloudy with a (30%) chance of showers  Monday night.
• snow level above 8,000 ft. Saturday through Sunday, 7,500 ft. Sunday night and Monday, then above 8,000 ft. Monday night and Tuesday.
• highs 56-54 warming to near 60 Tuesday lows near near 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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