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 72 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 13 in the Moderate 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:

• Patchy AM clouds and fog, mostly sunny this afternoon, mostly clear tonight,
• Mostly sunny and warmer Thursday, clear Thursday night,
• Then sunny and warmer Friday, clear at night.
• highs 85-92 lows 46-55.
• Mostly Sunny and a bit cooler Saturday and Sunday, mostly clear at night,
• Mostly sunny Monday AM, partly cloudy with a slight (20%) chance of showers in the afternoon, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers Monday night,
• Then partly cloudy with a slight (20%) chance of showers Tuesday.
• highs 88-77 lows near 54. (seasonal averages high 79 low 48)

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Forecast for the Umpqua Basin including Roseburg:

• Partly cloudy this AM, sunny and warmer this afternoon, clear tonight,
• Sunny and warmer Thursday and Friday, clear at night.
• highs 90-98 lows 55-58.
• Mostly sunny Saturday, mostly clear at night.
• Mostly sunny and cooler Sunday and Monday, mostly clear each night,
• Then partly cloudy and cooler with a slight (20%) chance of showers Tuesday.
• highs 92-80 lows 57-48. (seasonal averages high 81 low 53)

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

• Mostly cloudy this AM, sunny this afternoon, mostly clear tonight,
• Sunny Thursday and Friday, then mostly clear at night.
• highs near 67 lows near 55.
• Mostly sunny Saturday, Sunday and Monday, mostly clear each night, partly cloudy late Monday night,
• Then partly cloudy Tuesday with a slight (20%) chance of afternoon showers.
• highs near 67 lows 55-49. (seasonal averages high 65 low 51).

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Forecast for the Cascades in Lane County:

• Sunny and warmer today, Thursday and Friday, clear at night.
• free air freezing level 15,000 ft. today through Thursday, then 16,000 ft. Thursday night through Friday night.
• highs 76-83 lows 46-50.
• Mostly sunny and a bit cooler Saturday, Sunday and Monday, mostly clear Saturday night and Sunday night, partly cloudy with a slight (20%) chance of showers late Monday night and Tuesday (much cooler).
• free air freezing level 15,000 ft. Saturday and Saturday night, 14,000 ft. Sunday, 15,000 ft. Sunday night and Monday, snow level above 8,000 ft. Monday night and Tuesday.
• highs 78-64 lows 46-48.

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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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