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 down from the Canadian coast to continue the cooler 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 31 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 7 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 32 in the Good category measuring Ozone.

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

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Advisories:

• A RED FLAG WARNING REMAINS IN EFFECT FOR GUSTY WINDS AND LOW HUMIDITIES FROM NOON TODAY UNTIL 9 PM THIS EVENING FOR THE LOWER COLUMBIA BASIN OF OREGON.
• 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 clear tonight,
• Mostly sunny and warmer Thursday and Friday (a bit cooler), mostly clear Thursday night, partly cloudy Friday night,
• A mix of clouds and sun and cooler Saturday, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late Saturday night.
• lows 50-57 highs 86-79.
• A mix of clouds and sun Sunday with a slight (20%) chance of showers, becoming mostly cloudy 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:

• Mostly clear with patchy smoke tonight,
• Sunny with patchy smoke and a bit warmer Thursday, mostly clear with patchy smoke Thursday night,
• Mostly sunny and a bit warmer with patchy smoke Friday, partly cloudy with patchy smoke Friday night and Saturday (a bit cooler), then mostly cloudy with patchy smoke Saturday night.
• lows 56-59 highs 86-89 .
• Mostly cloudy Sunday with patchy smoke, a slight (20%) chance of showers with patchy smoke Sunday night through Monday evening, just partly cloudy with more patchy smoke Monday night,
• 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:

• Mostly clear this evening, partly cloudy late tonight and Thursday AM, sunny in the afternoon, mostly clear at night,
• Partly cloudy Friday AM, sunny in the afternoon, partly cloudy in the evening, then mostly cloudy late Friday night through Saturday night.
• lows 54-58 highs 65-67 cooling back to 65 Friday.
• Mostly cloudy Sunday, mostly cloudy with a slight (20%) chance of showers late Sunday night through Monday evening, then just partly cloudy late Monday night through Wednesday.
• highs near 66 lows near 57. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Mostly sunny Thursday, mostly clear at night,
• Mostly sunny in the AM, then partly cloudy with a slight (20%) chance of showers and thunderstorms Friday afternoon, just partly cloudy Friday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Saturday and in the evening, then mostly cloudy with a slight (20%) chance of showers late Saturday night.
• free air freezing level 14,000 ft. tonight through Thursday night, snow level above 8,000 ft. Friday, free air freezing level 13,000 ft. Friday night, then snow level above 8,000 ft. Saturday and Saturday night.
• lows 46-50 cooling to 47 Saturday night highs 76-65.
• 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, 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 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.
• 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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