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.

________________

An upper level high (Shaded “Arch” shape with blue arrows) is building over us and that means sunshine and warming temperatures for another day, then we’ll start to cool down a bit.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 36 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

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

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

________________

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.

________________

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Sunny and warmer today, mostly clear tonight,
• Mostly sunny and a bit cooler Saturday, clear in the evening, partly cloudy late Saturday night through Sunday night.
• highs 94-80 lows 56-50.
• A mix of clouds and sun Monday AM, increasing clouds to mostly cloudy and cooler with a slight (20%) chance of showers 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)

______________

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.

_____

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.

________________

Forecast for the Umpqua Basin including Roseburg:

• Sunny and warmer today, mostly clear tonight,
• Sunny and cooler Saturday and Sunday, mostly clear at night,
• highs 99-88 lows 60-53.
• Partly cloudy 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 rain in the AM, then a (30%) chance of showers Thursday afternoon,
• highs 74-67 warming to 76 Thursday lows 50-55. (seasonal averages high 80 low 52)

________________

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

• Mostly cloudy with patchy coastal fog this AM while sunny inland, sunny this afternoon, mostly clear this evening, increasing clouds to mostly cloudy late tonight,
• Mostly cloudy in the AM, sunny Saturday afternoon, partly cloudy in the evening, mostly cloudy at night,
• Mostly sunny Sunday, then mostly clear at night.
• highs near 67 lows 57-54.
• 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).

________________

Forecast for the Cascades in Lane County:

• Sunny and warmer today, partly cloudy tonight,
• 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 15,000 ft. today through Saturday night, then 14,000 ft. Sunday and Sunday night.
• highs 86-68 lows 49-45.
• Partly cloudy Monday AM, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon, partly cloudy with a slight (20%) chance of showers 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.

_______________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________