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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The Jet Stream is swinging the air in from the west and then the southwest which will increase the moisture that’s headed our way. A frontal system will continue moving through the Pacific Northwest cooling us down and bringing at least a slight chance of precipitation.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 26 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 26 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:

• Partly cloudy this evening, becoming mostly cloudy with a slight (20%) chance of rain late tonight,
• Mostly cloudy with patchy AM fog and a slight (20%) chance of showers, partly cloudy and cooler Monday afternoon, mostly clear and colder Monday night,
• Partly cloudy with patchy AM fog, mostly sunny and a bit cooler Tuesday afternoon, mostly clear at night,
• Mostly sunny Wednesday, then just partly cloudy and just a bit cooler Wednesday night.
• lows 54-40 warming to 47 Wednesday night highs 74-70.
• Partly cloudy in the AM, mostly cloudy with a slight (20%) chance of rain Thursday afternoon and evening, a (40%) chance of rain late Thursday night and Friday AM, a (40%) chance of rain in the afternoon, partly cloudy with a slight (20%) chance of showers late Friday night,
• A mix of clouds and sun with a slight (20%) chance of showers Saturday and Sunday afternoon, mostly cloudy with a slight (20%) chance of showers Saturday evening, then just partly cloudy late Saturday night.
• highs 72-68 lows 53-46. (seasonal averages high 76 low 46)

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Forecast for the Umpqua Basin including Roseburg:

• Clear this evening, partly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of showers Monday AM, just partly cloudy and a bit cooler in the afternoon, mostly clear and cooler Monday night,
• Sunny Tuesday and Wednesday, mostly clear Tuesday night and Wednesday evening, then partly cloudy late Wednesday night.
• lows 56-45 warming to 48 Wednesday night highs 79-75 warming to 78 Wednesday.
• Mostly cloudy with a slight (20%) chance of rain and cooler Thursday and Thursday  night,
• Mostly cloudy with a (30%) chance of rain and cooler Friday and Friday night,
• Mostly cloudy with a (30%) chance of showers Saturday, then partly cloudy with a slight (20%) chance of showers Saturday night and Sunday.
• highs 73-67 lows 54-45. (seasonal averages high 77 low 50)

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

• Mostly clear this evening at the shore then mostly cloudy with a slight (20%) chance showers late tonight,
• Mostly cloudy with a slight (20%) chance of Monday AM, partly cloudy in the afternoon, mostly clear in the evening, partly cloudy and cooler Monday night and Tuesday AM, sunny and a bit cooler in the afternoon, mostly clear Tuesday night,
• Partly cloudy Wednesday AM, mostly sunny in the afternoon, mostly clear in the evening, then partly cloudy late Wednesday night.
• lows 56-48 warming to 52 Wednesday night highs near 65.
• Mostly cloudy with a (30%) chance of rain Thursday through Friday night,
• Mostly cloudy with a slight (20%) chance of showers Saturday, then partly cloudy with a slight (20%) chance of showers and a bit cooler Saturday night and Sunday.
• highs 66-60 lows 54-47. (seasonal averages high 65 low 49).

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Forecast for the Cascades in Lane County:

• Partly cloudy tonight,
• Mostly cloudy with a slight (20%) chance of showers Monday AM, just partly cloudy and a bit cooler in the afternoon, mostly clear and colder Monday night,
• Mostly sunny and a bit cooler Tuesday and a bit warmer Wednesday, mostly clear Tuesday night, partly cloudy Wednesday night.
• free air freezing level 14,000 ft. tonight, snow level above 8,000 ft. Monday, free air freezing level 14,000 ft. Monday night, 13,000 ft. Tuesday,  12,000 ft. Tuesday night and Wednesday, then 11,000 ft. Wednesday night.
• lows 45-37 highs 66-63 warming back to 66 Wednesday.
• More clouds to mostly cloudy and cooler with a slight (20%) chance of rain Thursday afternoon through Friday AM, a (30%) chance of rain in the afternoon and Friday night,
• A mix of clouds and sun with a (30%) chance of AM showers, a slight (20%) chance of showers Saturday afternoon and evening, just partly cloudy late  Saturday night,
• Then partly cloudy with a slight (20%) chance of showers Sunday afternoon.
• snow level above 8,000 ft. Thursday through Friday night, 7,500 ft. Saturday, then 7,000 ft. Saturday night and Sunday.
• highs 69-53 lows near 42-35.

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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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