Here is my weekly weather quiz question for the last time. What is “Latent Heat Flux?” Here is the correct answer. Latent Heat Flux is the flux of heat from the earth’s surface to the atmosphere that is associated with evaporation or condensation of water vapor at the surface; a component of the surface energy budget. I’ll have a new weekly weather quiz question for you starting Monday. 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 returning the sunshine because it pushed a frontal system moved through the Pacific Northwest Thursday spread some much-needed rain over the area. Now we dry out again. Our next frontal system will arrive between Sunday night and Monday.

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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 8 in the Good 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:

• Mostly sunny and a bit warmer this afternoon, mostly clear tonight,
• Mostly sunny Sunday AM, partly cloudy and a bit warmer in the afternoon and evening, mostly cloudy with a slight (20%) chance of rain late Sunday night,
• Mostly cloudy with patchy AM fog and a slight (20%) chance of showers, partly cloudy and a bit cooler Monday afternoon, then mostly clear Monday night.
• highs 80-74 lows 50-42.
• Mostly sunny and a bit cooler Tuesday, mostly clear at night,
• Mostly sunny Wednesday AM, partly cloudy and just a bit cooler in the afternoon and evening, mostly cloudy with a slight (20%) chance of rain late Wednesday night and Thursday AM, a (30%) chance of rain in the afternoon, then mostly cloudy with a good (50%) chance of rain Thursday night and Friday.
• highs 72-68 lows 44-49. (seasonal averages high 76 low 46)

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Your Saturday College Football Forecasts:

Ducks vs Georgia State at Autzen Stadium – Kickoff 11 AM PDT: Becoming mostly sunny 55 and warming as the game progresses to near 80, Wind- N 5-10 mph.

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Beavers vs San Jose State at Reser Stadium -Kickoff 5 PM PDT: Mostly sunny near 80 by the end of the game, Wind- N 5-10 mph.

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Forecast for the Umpqua Basin including Roseburg:

• Sunny and warmer today and Sunday, mostly clear tonight, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers Sunday night and Monday AM, partly cloudy and a bit cooler in the afternoon, mostly clear and cooler Monday night.
• highs 83-78 lows 53-56 cooling to 48 Monday night.
• Mostly sunny and a bit cooler Tuesday, mostly clear at night,
• Sunny Wednesday AM, partly cloudy in the afternoon and evening, then mostly cloudy with a slight (20%) chance of rain late Wednesday night through Friday.
• highs 73-67 lows 46-52. (seasonal averages high 78 low 51)

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

• Sunny today, mostly clear tonight,
• Partly cloudy Sunday and in the evening inland and mostly cloudy with a slight (20%) chance of showers late while a slight (20%) chance of coastal showers late Sunday night,
• Mostly cloudy with a slight (20%) chance of inland showers Monday AM, sunny in the afternoon, then mostly clear and cooler Monday night.
• highs 70-67 warming back to 70 Monday lows 54-48.
• Partly cloudy Tuesday AM, sunny in the afternoon,  mostly clear Tuesday night,
• Sunny Wednesday AM, partly cloudy and a bit cooler in the afternoon and evening, mostly cloudy with a slight (20%) chance of rain late Wednesday night,
• Then mostly cloudy with a (30%) chance of rain Thursday through Friday.
• highs near 65 lows 49-52. (seasonal averages high 65 low 50).

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Forecast for the Cascades in Lane County:

• Mostly sunny and warmer today and Sunday, mostly clear tonight, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late Sunday night,
• Mostly cloudy with a slight (20%) chance of showers Monday AM, partly cloudy and a bit cooler in the afternoon, then mostly clear Monday night.
• free air freezing level 14,000 ft. today through Sunday, snow level above 8,000 ft. Sunday night and Monday, then free air freezing level 13,000 ft. Monday night.
• highs near 68 lows 42-45 cooling to 38 Monday night.
• Mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear Tuesday night, partly cloudy Wednesday night,
• Partly cloudy in the AM, mostly cloudy and cooler with a slight (20%) chance of rain Thursday afternoon through Friday.
• free air freezing level 13,000 ft. Tuesday, 12,000 ft. Tuesday night, 11,000 ft. Wednesday and Wednesday night, snow level above 8,000 ft. Thursday and Thursday night, then 7,000 ft. Friday.
• highs 65-53 lows near 38-40.

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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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