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 and then the southwest which will increase the moisture that’s headed our way. A frontal system will continue moving through the Pacific Northwest cooling us down and bringing at least a slight chance of precipitation. The Autumnal Equinox which begins the Fall 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 earlier than the Pacific Time Zone.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 28 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:

• Mostly cloudy with patchy AM fog and a slight (20%) chance of showers, mostly sunny and cooler this afternoon, mostly clear and colder tonight,
• Partly cloudy with patchy AM fog, mostly sunny and a bit cooler Tuesday afternoon, mostly clear at night,
• Mostly sunny Wednesday, then just partly cloudy and just a bit cooler Wednesday night.
• lows 45-48 highs 74-70.
• Partly cloudy Thursday and in the evening, a (30%) chance of rain late Thursday night and Friday AM, a (40%) chance of rain in the afternoon, partly cloudy with a slight (20%) chance of showers late Friday night,
• A mix of clouds and sun with a slight (20%) chance of showers Saturday and Sunday afternoon, mostly cloudy with a slight (20%) chance of showers Saturday evening, then just partly cloudy late Saturday night.
• highs 77-68 lows 53-45. (seasonal averages high 76 low 46)

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Forecast for the Umpqua Basin including Roseburg:

• Mostly cloudy with a slight (20%) chance of showers this AM, just partly cloudy and a bit cooler this afternoon, mostly clear and cooler tonight,
• Sunny Tuesday and Wednesday, mostly clear both nights.
• highs 79-75 warming to 78 Wednesday lows 49-45 warming to 48 Wednesday night.
• Mostly cloudy Thursday AM, partly cloudy in the afternoon, mostly cloudy with  slight (20%) chance of rain Thursday  night,
• Mostly cloudy with a (30%) chance of rain and cooler Friday and Friday night,
• Mostly cloudy with a slight (20%) chance of showers Saturday, then partly cloudy with a slight (20%) chance of showers Saturday night and Sunday.
• highs 73-67 lows 54-45. (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 a slight (20%) chance of showers this AM, partly cloudy this afternoon, mostly clear this evening, partly cloudy and cooler late tonight and Tuesday AM, sunny and a bit cooler in the afternoon, mostly clear in the evening, partly cloudy late Tuesday night,
• Partly cloudy Wednesday AM, mostly sunny in the afternoon, mostly clear in the evening, then partly cloudy late Wednesday night.
• highs near 65 lows 48-52.
• Mostly cloudy with a (30%) chance of rain Thursday through Friday night,
• Mostly cloudy with a slight (20%) chance of showers Saturday, then partly cloudy with a slight (20%) chance of showers and a bit cooler Saturday night and Sunday.
• highs 66-60 lows 54-47. (seasonal averages high 65 low 49).

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of showers this AM, mostly sunny this afternoon, mostly clear and colder tonight,
• Mostly sunny and a bit cooler Tuesday and a bit warmer Wednesday, mostly clear Tuesday night, partly cloudy Wednesday night.
• free air freezing level 13,000 ft. today through Tuesday, 12,000 ft. Tuesday night through Wednesday night.
• highs 63-66 lows 40-36 warming to 38 Wednesday night.
• Partly cloudy and cooler Thursday and in the evening, mostly cloudy with a slight (20%) chance of rain late Thursday night,
• A mix of clouds and sun Friday with a slight (20%) chance of AM rain and  a (40%) chance of rain in the afternoon and evening, a slight (20%) chance of showers late Friday night,
• A mix of clouds and sun with a slight (20%) chance of showers Saturday,  partly cloudy with a slight (20%) chance of evening showers, just mostly cloudy late  Saturday night,
• Mostly sunny Sunday AM, then partly cloudy with a slight (20%) chance of showers Sunday afternoon.
• Free air freezing level 12,000 ft. Thursday, snow level above 8,000 ft.  Thursday night through Saturday, then 7,500 ft. Saturday night and Sunday.
• highs 69-52 lows near 42-34.

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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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