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 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 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:

• Mostly clear  tonight,
• Partly cloudy Wednesday, mostly clear at night,
• Mostly sunny and warmer Thursday, clear Thursday night,
• Then sunny and warmer Friday, clear at night.
• lows 49-46 warming to 55 Friday night highs 85-92.
• Mostly Sunny Saturday and Sunday, mostly clear both nights,
• Mostly sunny, but cooler Sunday, mostly clear at night,
• Mostly sunny Monday AM, then partly cloudy and a bit cooler Monday night and Tuesday.
• highs 90-77 lows near 54. (seasonal averages high 79 low 48)

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Forecast for the Umpqua Basin including Roseburg:

• Mostly clear tonight,
• Partly cloudy Wednesday AM, sunny and warmer in the afternoon, clear Wednesday night,
• Sunny and warmer Thursday and Friday, clear at night,
• Then mostly sunny Saturday, mostly clear at night.
• lows 56-60 highs 92-99.
• 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 94-80 lows 55-48. (seasonal averages high 81 low 53)

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

• Partly cloudy this evening, mostly cloudy late tonight and Wednesday AM, sunny and in the afternoon, mostly clear Wednesday night,
• Sunny Thursday and Friday, then mostly clear at night.
• lows 56-53 highs 72-67 warming to 70.
• 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 73-67 lows 56-53. (seasonal averages high 66 low 51).

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Forecast for the Cascades in Lane County:

• Partly cloudy this evening, clear late tonight,
• Mostly sunny Wednesday, mostly clear at night,
• Then sunny and a bit warmer Thursday and Friday, clear at night.
• free air freezing level 15,000 ft. tonight through Thursday, then 16,000 ft. Thursday night through Friday night.
• lows 40-50 highs 76-83.
• Mostly sunny and a bit cooler Saturday, Sunday and Monday, mostly clear Saturday night and Sunday night, then partly cloudy 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, 14,000 ft. Monday night, then 10,000 ft. Tuesday.
• highs 80-64 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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