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 west. A frontal system is poised offshore and will be moving in.  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 31 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 27 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:

• A mix of clouds and sun this afternoon, partly cloudy this evening, mostly cloudy with a slight (20%) chance of rain late tonight,
• Mostly cloudy with a (40%) chance of AM rain, a (40%) chance of showers and cooler Friday afternoon (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers in the evening, partly cloudy late Friday night (under 0.10 in. of rain possible),
• A mix of clouds and sun and a bit cooler Saturday, then partly cloudy at night.
• highs 80-70 lows 50-45.
• Partly cloudy with a slight (20%) chance of showers Sunday afternoon and   Sunday night,
• A mix of clouds and sun  and a bit cooler with a slight (20%) chance of showers Monday and Tuesday (cooler), mostly cloudy with a slight (20%) chance of showers Monday night, partly cloudy with a slight (20%) chance of showers Tuesday night and Wednesday morning, then just partly cloudy Wednesday afternoon.
• highs 72-67 warming to back to 72 Tuesday and Wednesday lows 46-48. (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 the chance of showers tapering off to a slight chance in the evening then just mostly cloudy 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 68 and cooling through the 60s as the game progresses.

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Forecast for the Umpqua Basin including Roseburg:

• Partly cloudy this afternoon and this evening, mostly cloudy with  slight (20%) chance of rain late tonight,
• Mostly cloudy with a slight (20%) chance of showers and cooler Friday afternoon and evening, just mostly cloudy late Friday night,
• Mostly cloudy with a slight (20%) chance of rain Saturday AM, mostly cloudy and cooler in the afternoon, then partly cloudy Saturday night.
• highs 83-74 lows 53-46.
• Partly cloudy with a slight (20%) chance of showers Sunday afternoon and evening, mostly cloudy with a (30%) chance of showers Sunday night through Tuesday, partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday night and Wednesday AM, just partly cloudy Wednesday afternoon.
• highs 74-70 warming back to 74 Wednesday lows 46-50. (seasonal averages high 76 low 50)

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

• Partly cloudy today, mostly cloudy with a slight (20%) chance of rain late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of rain Friday AM, mostly cloudy with a slight (20%) chance of showers in the afternoon and evening (under 0.10 in. of rain possible), just mostly cloudy Friday night,
• Then partly cloudy Saturday and Saturday night.
• highs near 65 lows 54-49.
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Sunday afternoon and evening, mostly cloudy with a (30%) chance of showers Sunday night through Monday night,
• Mostly cloudy with a slight (20%) chance of showers Tuesday AM, partly cloudy with a slight (20%) chance of showers in the afternoon through Wednesday AM, then just partly cloudy in the afternoon.
• highs 64-66 lows 48-52. (seasonal averages high 64 low 49).

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Forecast for the Cascades in Lane County:

• A mix of clouds and sun today, partly cloudy tonight,
• A mix of clouds and sun Friday, mostly cloudy in the evening, partly cloudy late Friday night,
• A mix of clouds and sun with a slight (20%) chance of showers and cooler Saturday afternoon, then just partly cloudy Saturday night.
• free air freezing level 13,000 ft. today and tonight, 12,000 ft. Friday and Friday night, snow level above 8,000 ft. Saturday, then free air freezing level 11,000 ft Saturday night.
• highs 65-58 warming to near 60 Saturday lows 43-36.
• Partly cloudy with a slight (20%) chance of showers Sunday afternoon and at night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday and Tuesday, mostly cloudy Monday evening, partly cloudy with a slight (20%) chance of showers both nights,
• Partly cloudy with a slight (20%) chance of showers Wednesday AM, then just partly cloudy Wednesday afternoon.
• snow level above 8,000 ft. Sunday through Wednesday.
• highs 57-54 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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