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 33 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 32 in the Good category measuring Ozone.

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:

• Clear tonight,
• Sunny and warmer Friday, clear in the evening, partly cloudy and cooler late at night through Sunday night.
• lows 56-50 highs 94-80.
• A mix of clouds and sun Monday AM, increasing clouds to mostly cloudy and cooler with a slight (20%) chance of rain in the afternoon and evening, 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, mostly cloudy with a slight (20%) chance of evening showers, a good (50%) chance of showers Tuesday night and Wednesday AM, a good (50%) chance of rain and a bit cooler in the afternoon and Wednesday night,
• Mostly cloudy with a (40%) chance of AM rain, then a bit warmer with a (40%) chance of showers Thursday afternoon.
• highs 73-68 warming back to 73 Thursday lows 50-54. (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- (8 PM EDT): Partly cloudy 57 and cooling as the game progresses, Wind- NNE 5 mph.

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Beavers vs Michigan at Michigan Stadium, Ann Arbor, MI -Kickoff 9 AM PDT (12 PM EDT): Partly cloudy 58 warming to 65 by the end of the game, Wind-N 10 mph.

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Forecast for the Umpqua Basin including Roseburg:

• Clear tonight,
• Sunny and warmer Friday, clear Friday evening, partly cloudy Friday night through Saturday night,
• Mostly sunny and cooler Sunday, then mostly clear at night.
• lows 57-60 cooling to 53 Sunday night highs 98-88.
• Sunny Monday AM, increasing clouds to mostly cloudy with a slight (20%) chance of showers in the afternoon and evening, partly cloudy with a slight (20%) chance of showers late Monday night and Tuesday, mostly cloudy with a (30%) chance of showers Tuesday night,
• Mostly cloudy and a bit cooler with rain likely (70%) Wednesday and Wednesday night,
• Mostly cloudy with a (30%) chance of showers in the AM, then a slight (20%) chance of showers Thursday afternoon,
• highs 74-67 warming to 76 Thursday lows 50-55. (seasonal averages high 80 low 52)

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

• Clear this evening, partly cloudy late tonight,
• Mostly cloudy Friday AM, sunny in the afternoon, mostly clear in the evening, increasing clouds to mostly cloudy late Friday night,
• Cloudy in the AM, sunny Saturday afternoon, partly cloudy at night,
• Mostly sunny Sunday, then mostly clear at night.
• lows 54-57 cooling back to 54 Sunday night highs near 67.
• Partly cloudy with a slight (20%) chance of showers Monday and Monday night,
• Partly cloudy  with a slight (20%) chance of showers Tuesday AM, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon, a good (50%) chance of showers at night,
• Mostly cloudy with rain likely (70%) and a bit warmer Wednesday and Wednesday night,
• Mostly cloudy with a good (50%) chance of AM rain, then a bit warmer with a good (50%) chance of showers Thursday afternoon.
• highs 67-64 warming back to 67 Thursday lows 52-56. (seasonal averages high 65 low 51).

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and warmer Friday, clear in the evening, partly cloudy at night,
• Mostly sunny in the AM, partly cloudy and a bit cooler Saturday afternoon and Saturday night,
• Partly cloudy in the AM, mostly sunny, but cooler Sunday afternoon, then partly cloudy at night.
• free air freezing level 16,000 ft. tonight, then 15,000 ft. Friday through Sunday, then 14,000 ft. Sunday night.
• lows 48-45 highs 86-68.
• Partly cloudy Monday AM, mostly cloudy and a bit cooler  with a slight (20%) chance of showers in the afternoon and late Monday night,
• A mix of clouds and sun and cooler with a slight (20%) chance of showers Tuesday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy  with a good (50%) chance of showers Tuesday night and Wednesday AM, rain likely (60%) and a bit warmer in the afternoon and evening, a good (50%) chance of rain late Wednesday night,
• Mostly cloudy with a (40%) chance of AM rain, then a (40%) chance of showers and a bit cooler Thursday afternoon.
• snow level above 8,000 ft. Monday and Monday night, 6,500 ft. Tuesday and Tuesday night, then above 8,000 ft. Wednesday through Thursday.
• highs 62-57 warming back to 62 Thursday lows 38-45.

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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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