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.  It already sent cold front through the Pacific Northwest with cooled our temperatures down to below normal. It will continue to send disturbances our way. Another frontal system will be on the way to push through next Monday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 28 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 29 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:

• Cloudy with a (30%) chance of evening rain, a slight (20%) chance of rain late tonight (under 0.10 in. of rain possible),
• Rain and a bit cooler Wednesday (0.25 in. of rain possible) and Wednesday night (0.25 in. of rain possible),
• Showers likely (70%) Thursday AM, a mix of clouds and sun and a bit warmer with a good (50%) chance of showers Thursday afternoon (under 0.10 in. of rain possible), partly cloudy with a slight (20%) chance of showers in the evening and just mostly cloudy at night (under 0.10 in. of rain possible),
• Then just partly cloudy and a bit warmer Friday and Friday night.
• lows 48-53 cooling back to 48 Thursday night and Friday night highs 66-76.
• Partly cloudy Saturday and Saturday night,
• A mix of clouds and sun Sunday, partly cloudy in the evening, mostly cloudy late Sunday night with a (40%) chance of rain,
• Mostly cloudy with a (40%) chance of rain Monday AM,  just mostly cloudy and cooler in the afternoon and evening, then partly cloudy late Monday and Tuesday.
• highs 80-75 lows 49-53 cooling to 46 Monday night. (seasonal averages high 77 low 47)

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Forecast for the Umpqua Basin including Roseburg:

• Cloudy with a (30%) chance of rain tonight (under 0.10 in. of rain possible),
  Mostly cloudy and a bit cooler with rain Wednesday (0.20 in. of rain possible), showers at night (0.15 in. of rain possible),
• Mostly cloudy with AM showers likely (60%), a good (50%) chance of showers and warmer Thursday afternoon and evening (0.15 in. of rain possible), just mostly cloudy late Thursday night and Friday AM, sunny and warmer in the afternoon, then mostly clear Friday night.
• lows 48-54 cooling to near 50 Thursday night and Friday night highs 66-80.
• Mostly sunny and warmer Saturday and Sunday, mostly clear Saturday night and Sunday evening, mostly cloudy with a slight (20%) chance of rain late Sunday night,
• Mostly cloudy with a slight (20%) chance of rain Monday AM, just mostly cloudy in the evening, then partly cloudy late Monday night and Tuesday.
• highs 82-84 cooling to 78 Tuesday lows 52-55 cooling back to 52 Monday night. (seasonal averages high 79 low 52)

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

• Cloudy with a good (50%) chance of rain tonight (under 0.10 in. of rain possible),
• Rain Wednesday (0.30 in. of rain possible), showers at night (0.25 in. of rain possible),
• Mostly cloudy with AM showers likely (70%) Thursday (0.15 in. of rain possible), a good (50%) chance of showers in the afternoon (0.15 in. of rain possible), mostly cloudy with a slight (20%) chance of evening coastal showers and partly cloudy with patchy fog late at night while partly cloudy inland with patchy fog late Thursday night ,
• Partly cloudy with patchy fog Friday AM, partly cloudy and a bit warmer Friday afternoon and Friday night.
• lows 52-55 cooling back to 52 Thursday night warming to 54 Friday night highs 63-67.
• Partly cloudy Saturday through Sunday, mostly cloudy with a slight (20%) chance of rain Sunday night and Monday, mostly cloudy in the evening, partly cloudy and cooler Monday night,
• Then just partly cloudy Tuesday.
• highs near 66 lows 55-50. (seasonal averages high 65 low 50).

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Forecast for the Cascades in Lane County:

• Cloudy with a (30%) chance of evening rain and snow, a slight (20%) chance of rain and snow late tonight (under 0.10 in. of rain possible),
• Mostly cloudy and cooler with rain Wednesday and in the evening, showers late Wednesday night,
• AM showers likely (70%), a good (50%) chance of showers and a bit warmer Thursday afternoon, partly cloudy with a slight (20%) chance of showers in the evening, then just mostly cloudy late Thursday night,
• Partly cloudy Friday AM, mostly sunny and warmer Friday afternoon, then partly cloudy Friday night.
• snow level 6,000 ft. tonight, 6,500 ft. Wednesday through Thursday, then above 8,000 ft. Thursday night,
• lows 37-40 highs 52-65.
• Partly cloudy Saturday through Sunday, partly cloudy with a slight (20%) chance of showers late Sunday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of rain Monday, partly cloudy with a slight (20%) chance of evening rain, then just partly cloudy late Monday night and warmer Tuesday.
• free air freezing level 14,000 ft. Saturday through Sunday, snow level above 8,000 ft. Sunday night through Monday, then free air freezing level 11,000 ft. Tuesday.
• highs 70-60 warming to 65 Tuesday lows 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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