Here is my new weekly weather quiz question. What is “Latent Heat Flux?” 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 low (Shaded “U” shape with blue arrows) has slowly taken over. A frontal system moved through the Pacific Northwest spreading some much-needed rain over the area. More disturbances will head our way including this frontal system that will push through next Monday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 25 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 4 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 24 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 cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms this evening, a slight (20%) chance of showers late this evening, partly cloudy with patchy fog late tonight (under 0.10 in. of rain possible, more in storms),
• A mix of clouds and sun with patchy AM fog Friday, mostly sunny and warmer in the afternoon, partly cloudy with patchy fog late Friday night,
• Patchy AM fog Saturday, mostly sunny and a bit warmer in the afternoon, mostly clear at night,
• Mostly sunny Sunday AM, partly cloudy and a bit warmer in the afternoon and evening, then mostly cloudy with a slight (20%) chance of showers late Sunday night.
• lows 47-54 highs 76-80.
• Partly cloudy with a slight (20%) chance of showers Monday AM, partly cloudy and a bit cooler in the afternoon and evening, partly cloudy late Monday night.
• Mostly sunny and a bit cooler Tuesday, partly cloudy at night,
• Mostly sunny Wednesday AM, partly cloudy and just a bit warmer in the afternoon and evening, mostly cloudy with a (30%) chance of rain late Wednesday night,
• Then mostly cloudy with a (40%) chance of rain Thursday.
• highs 74-72 lows 43-47. (seasonal averages high 77 low 47)

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Forecast for the Umpqua Basin including Roseburg:

• Mostly cloudy with a slight (20%) chance of evening showers, just partly cloudy late tonight and Friday AM, sunny and warmer in the afternoon, mostly clear Friday night,
• Sunny and warmer Saturday and Sunday, clear Saturday night, then partly cloudy with a slight (20%) chance of showers Sunday night.
• lows 50-56 highs 79-85.
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Monday, partly cloudy and cooler at night,
• Mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear Tuesday night, partly cloudy Wednesday evening, then mostly cloudy with a slight (20%) chance of rain late Wednesday night and Thursday.
• highs 77-75 lows 45-49. (seasonal averages high 78 low 51)

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

• Mostly cloudy with a slight (20%) chance of evening showers, partly cloudy with patchy fog late tonight and Friday AM, sunny and a bit warmer in the afternoon, mostly clear in the evening, partly cloudy late Friday night,
• Sunny Saturday and Sunday, mostly clear Saturday night, then partly cloudy with a slight (20%) chance of showers Sunday night.
• lows 52-56 highs near 66.
• Partly cloudy with a slight (20%) chance of showers Monday, partly cloudy Monday night and Tuesday, mostly clear Tuesday night,
• Mostly sunny Wednesday, partly cloudy in the evening, then mostly cloudy with a (30%) chance of rain late Wednesday night and Thursday.
• highs 67-65 lows 55-49. (seasonal averages high 65 low 50).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms this evening, just partly cloudy late tonight (under 0.10 in. of rain possible, more in storms),
• Mostly sunny and warmer Friday, Saturday and Sunday, mostly clear Friday night and Saturday night, then partly cloudy Sunday night.
• snow level 7,500 ft. tonight, free air freezing level 10,000 ft. Friday and Friday night, 12,000 ft. Saturday, 13,000 ft. Saturday night and Sunday, then 14,000 ft. Sunday night.
• lows 38-46 cooling to 40 Sunday night highs 65-70.
• Partly cloudy and a bit cooler Monday through Tuesday AM, mostly sunny in the afternoon, mostly clear at night,
• Mostly sunny Wednesday AM, partly cloudy in the afternoon and evening, mostly cloudy with a slight (20%) chance of rain late Wednesday night and Thursday AM, then mostly cloudy with a (40%) chance of rain Thursday afternoon.
• free air freezing level 13,000 ft. Monday and Monday night, 12,000 ft. Tuesday and Tuesday night, 11,000 ft. Wednesday, then snow level above 8,000 ft. Wednesday night and Thursday.
• highs 62-65 cooling to near 60 Thursday lows near 42-38 warming back to 42 Wednesday night.

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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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