Here is my new weekly weather quiz question. What is the “dew point?”  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 pressure trough (Shaded “U” shape with blue arrows) is moving away as short-lived high pressure moves in for a couple of days of warmer weather. A frontal system will move in Sunday cooling us down and possibly bringing some rain.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 70 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 11 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

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

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Advisories:

• A HEALTH ADVISORY HAS BEEN ISSUED 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 warmer today and Friday, mostly clear both nights,
• A mix of clouds and sun and cooler Saturday with a slight (20%) chance of afternoon rain, partly cloudy with a slight (20%) chance of rain in the evening, mostly cloudy with a slight (20%) chance of rain late Saturday night.
• highs 85-80 lows 54-57.
• A mix of clouds and sun Sunday with a slight (20%) chance of showers, becoming mostly cloudy with a slight (20%) chance of showers at night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday, mostly cloudy with a slight (20%) chance of evening showers, then partly cloudy late Monday night through Wednesday.
• highs 79-82 lows 57-53. (seasonal averages high 84 low 52)

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Forecast for the Umpqua Basin including Roseburg:

• Sunny with patchy smoke and a bit warmer today, mostly clear with patchy smoke tonight,
• Mostly sunny and a bit warmer with patchy smoke Friday, partly cloudy with patchy smoke Friday night and Saturday (a bit cooler), partly cloudy with patchy smoke in the evening, then partly cloudy with patchy smoke and a slight (20%) chance of rain late Saturday night.
• highs 86-89 lows 58-62 cooling back to 58 Saturday night.
• Mostly cloudy Sunday with patchy smoke, patchy smoke with a slight (20%) chance of showers Sunday night through Monday evening, just partly cloudy with more patchy smoke late Monday night,
• Then partly cloudy with patchy smoke and a slight (20%) chance of thunderstorms Tuesday through Wednesday.
• highs 84-82 warming back to 84 Tuesday lows near 60. (seasonal averages high 86 low 56)

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

• Partly cloudy this AM, sunny this afternoon, mostly clear tonight,
• Partly cloudy Friday and in the evening, mostly cloudy late Friday night, mostly cloudy with a slight (20%) chance of coastal rain Saturday AM, just mostly cloudy in the afternoon, mostly cloudy with a slight (20%) chance of rain at night.
• highs near 67 lows 56-58.
• Mostly cloudy with a slight (20%) chance of showers Sunday through Monday evening, then just partly cloudy late Monday night through Wednesday.
• highs near 67-65 lows near 56. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Mostly sunny today and Friday, mostly clear both nights,
• Partly cloudy and a bit cooler Saturday and in the evening, then mostly cloudy Saturday night.
• free air freezing level 14,000 ft. today and tonight, 13,000 ft. Friday through Saturday, then 12,000 ft. Saturday night.
• highs 75-67 lows 44-47.
• A mix of clouds and sun Sunday with a slight (20%) chance of AM showers, a slight (20%) chance of showers and thunderstorms and a bit warmer in the afternoon, mostly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, partly cloudy with a slight (20%) chance of showers late Sunday night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday AM, mostly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, partly cloudy with a slight (20%) chance of showers late Monday night through Tuesday evening, just partly cloudy Tuesday night,
• Then partly cloudy with a slight (20%) chance of showers Wednesday afternoon.
• snow level above 8,000 ft. Sunday through Wednesday.
• highs 66-69 lows 48-45.

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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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