Here is my new weekly weather quiz question. What is “Rayleigh Scattering?” 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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An upper level high (Shaded “Arch” shape with blue arrows) is building over us and that means sunshine and warming temperatures for a while.

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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 9 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 29 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:

• Sunny and warmer today and Friday, clear at night,
• A mix of clouds and sun in the AM, partly cloudy and just a bit cooler Saturday afternoon, partly cloudy at night.
• highs 88-92 cooling back to 88 Saturday lows 54-56.
• Partly cloudy and cooler Sunday through Monday AM, mostly cloudy and cooler with a slight (20%) chance of rain in the afternoon, a slight (20%) chance of evening rain, a slight (20%) chance of showers late Monday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Tuesday,  partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of Tuesday, a (30%) chance of  night and Wednesday afternoon.
• highs 82-70 lows near 50. (seasonal averages high 79 low 48)

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Your Saturday College Football Forecasts:

Ducks vs Michigan State at Spartan Stadium, East Lansing, MI- Kickoff 5 PM PDT- (7 PM CDT): Partly cloudy 60 cooling into the 50s as the game progresses, Wind- N 10 mph.

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Beavers vs Michigan at Michigan Stadium, Ann Arbor, MI -Kickoff 9 AM PDT (11 AM CDT): Partly cloudy 52 warming to 65 by the end of the game, Wind-N 10 mph.

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Forecast for the Umpqua Basin including Roseburg:

• Sunny and warmer today and Friday, clear tonight and Friday evening, partly cloudy at night,
• Partly cloudy Saturday and Saturday night.
• highs 95-98 cooling to 92 Saturday lows 57-62 cooling back to 57 Saturday night.
• Mostly sunny and cooler Sunday, mostly clear at night,
• Sunny Monday AM, increasing clouds to mostly cloudy in the afternoon and evening, partly cloudy with a slight (20%) chance of showers late Monday night,
• Partly cloudy with a slight (20%) chance of showers Tuesday AM, mostly cloudy in the afternoon, a slight (20%) chance of showers Tuesday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday AM, then a (40%) chance of rain Wednesday afternoon.
• highs 89-76 lows 54-52. (seasonal averages high 80 low 52)

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

• AM patchy fog and clouds, sunny this afternoon and Friday, partly cloudy tonight, mostly cloudy Friday night,
• AM clouds, partly cloudy Saturday and at night.
• highs near 67 lows 54-58 cooling back to 54 Saturday night.
• Mostly sunny Sunday, mostly clear at night,
• Mostly sunny Monday AM, increasing clouds to mostly cloudy in the afternoon, partly cloudy with a slight (20%) chance of shower Monday night and Tuesday, mostly cloudy with a slight (20%) chance of showers at night,
• A slight (20%) chance of showers Wednesday AM, then a (30%) chance of rain in the afternoon.
• highs 67-63 lows near 53. (seasonal averages high 65 low 51).

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Forecast for the Cascades in Lane County:

• Sunny and warmer today and Friday, clear at night,
• Partly cloudy and a bit cooler Saturday and Saturday night.
• free air freezing level 16,000 ft. today and tonight, then 15,000 ft. Friday through Saturday night.
• highs 78-85 cooling to back to near 80 Saturday lows 48-46.
• Partly cloudy in the AM, mostly sunny, but cooler Sunday afternoon, partly cloudy at night,
• Partly cloudy Monday AM, mostly cloudy and a bit cooler in the afternoon, mostly cloudy with a slight (20%) chance of showers late Monday night through Wednesday AM, then a (30%) chance of rain in the afternoon.
• free air freezing level 15,000 ft. and Sunday night, 12,000 ft. Monday, snow level above 8,000 ft. Monday night through Wednesday.
• highs 70-56 lows 46-40.

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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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