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 32 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 36 in the Good category measuring Ozone.

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

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Advisories:

• A RED FLAG WARNING IS IN EFFECT UNTIL 9 PM TODAY FOR THE EAST SLOPES OF THE NORTH OREGON CASCADES, THE LOWER COLUMBIA BASIN OF OREGON AND THE EASTERN COLUMBIA RIVER GORGE.
• 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 and cooler tonight,
• Mostly sunny Wednesday, mostly sunny and warmer Thursday and Friday, clear to partly cloudy each night,
• lows 50-56 highs 83-87.
• Partly cloudy and cooler Saturday and in the evening, mostly cloudy with a slight (20%) chance of showers late Saturday night,
• A mix of clouds and sun Sunday with a slight (20%) chance of AM showers, mostly cloudy at night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday afternoon, mostly cloudy with a slight (20%) chance of evening showers, then partly cloudy late Monday night and Tuesday.
• highs near 80 lows 58-55. (seasonal averages high 84 low 52)

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Forecast for the Umpqua Basin including Roseburg:

• Mostly clear with patchy smoke tonight,
• Partly cloudy in the AM, sunny and hazy with patchy smoke and cooler Wednesday afternoon, mostly clear with haze and patchy smoke at night,
• Sunny and hazy with patchy smoke and a bit warmer Thursday, mostly clear with haze and patchy smoke in the evening, mostly clear with patchy smoke Thursday night,
• Mostly sunny and a bit warmer with patchy smoke Friday, then mostly clear with patchy smoke at night.
• lows near 58 highs 86-89.
• Partly cloudy with patchy smoke Saturday and in the evening, mostly cloudy with patchy smoke late Saturday night,
• Mostly cloudy Sunday with patchy smoke and a slight (20%) chance of thunderstorms Sunday afternoon and Sunday night,
• Mostly cloudy with a slight (20%) chance of showers Monday afternoon and evening, then just partly cloudy Monday night and Tuesday.
• highs 84-82 warming back to 84 Tuesday lows near 60. (seasonal averages high 86 low 57)

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

• Partly cloudy with patchy inland smoke this evening, mostly cloudy with patchy inland smoke late tonight and Wednesday AM, sunny in the afternoon, mostly clear in the evening, partly cloudy late Wednesday night,
• Partly cloudy in the AM, sunny Thursday afternoon, mostly clear at night,
• Sunny Friday, mostly clear in the evening, then mostly cloudy Friday night.
• lows 56-58 highs 65-67 cooling back to 65 Friday.
• Mostly cloudy Saturday through Sunday night,
• Mostly cloudy with a slight (20%) chance of showers Monday afternoon, and evening, then just partly cloudy late Monday night and Tuesday.
• 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 and cooler tonight,
• Mostly sunny Wednesday and Thursday, mostly clear both nights,
• Mostly sunny in the AM, partly cloudy with a slight (20%) chance of showers and thunderstorms Friday afternoon and Friday night.
• free air freezing level 13,000 ft. tonight, 12,000 ft. Wednesday, 13,000 ft. Wednesday night through Thursday night, snow level above 8,000 ft Friday and Friday night.
• lows 46-49 highs 72-76 cooling back to 72 Friday.
• Partly cloudy with a slight (20%) chance of showers and thunderstorms Saturday and in the evening, mostly cloudy with a slight (20%) chance of showers late Saturday night,
• A mix of clouds and sun Sunday with a slight (20%) chance of AM showers Sunday, a slight (20%) chance of showers and thunderstorms and a bit warmer in the afternoon, partly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, a slight (20%) chance of showers late Sunday night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday, mostly cloudy with a slight (20%) chance of showers in the evening, partly cloudy with a slight (20%) chance of showers late at night and Tuesday AM, then just partly cloudy Tuesday afternoon.
• snow level above 8,000 ft. Saturday through Tuesday.
• highs 63-66 warming to 70 Monday lows near 48.

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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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