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.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

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 AND 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:

• Partly cloudy this AM, mostly sunny this afternoon, mostly clear and cooler tonight,
• Mostly sunny Wednesday and Thursday, partly cloudy Wednesday night, mostly clear Thursday night.
• highs 85-83 warming to 86 Thursday lows 52-50 warming to 54 Thursday night.
• Mostly sunny and a bit warmer Friday, partly cloudy at night,
• Partly cloudy and cooler Saturday with a slight (20%) chance of afternoon and evening showers, mostly cloudy late Saturday night,
• Then a mix of clouds and sun Sunday, mostly cloudy at night,
• Then a mix of clouds and sun with a slight (20%) chance of showers Monday afternoon.
• highs 87-82 lows near 56. (seasonal averages high 84 low 52)
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  Eugene/Springfield Pollen Count:
  Trees: Low- 4

Grass: Moderate- 5*

Reading as of: 7/25/15

*Now the grass pollen season is officially over.

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Forecast for the Umpqua Basin including Roseburg:

• Sunny with areas of smoke this AM, partly cloudy this afternoon, mostly clear tonight,
• 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, then mostly clear with haze and patchy smoke in the evening, then just partly cloudy Thursday night.
• highs 88-85 warming to 90 Thursday lows near 58.
• Sunny and a bit warmer Friday, partly cloudy Friday night through Saturday evening, mostly cloudy late Saturday night,
• Mostly cloudy Sunday with a slight (20%) chance of thunderstorms Sunday afternoon and Sunday night,
• Then mostly cloudy with a slight (20%) chance of showers Monday afternoon.
• highs 89-86 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 at the shore this afternoon while partly cloudy inland with patchy smoke this afternoon, partly cloudy with patchy inland smoke this evening, mostly cloudy late tonight,
• Mostly cloudy Wednesday AM, sunny in the afternoon, then mostly clear Wednesday night,
• Mostly sunny Thursday, then mostly clear at night.
• highs 65-68 lows near 56.
• Partly cloudy Friday and Friday night,
• Mostly cloudy Saturday through Sunday night,
• Then mostly cloudy with a slight (20%) chance of showers Monday afternoon.
• highs near 66 lows near 56. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Mostly sunny this AM, partly cloudy and cooler this afternoon, mostly clear and cooler tonight,
• Mostly sunny Wednesday and Thursday, mostly clear both nights.
• free air freezing level 13,000 ft. today  tonight, 12,000 ft. Wednesday, 13,000 ft. Wednesday night through Thursday night.
• highs 76-72 warming back to 76 Thursday lows 46-49.
• Mostly sunny in the AM, partly cloudy with a slight (20%) chance of showers and thunderstorms Friday afternoon through Saturday evening, mostly cloudy with a slight (20%) chance of showers late Saturday night,
• A mix of clouds and sun with a slight (20%) chance of showers Sunday AM, 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,
• Then a mix of clouds and sun with a slight (20%) chance of showers Monday.
• snow level above 8,000 ft. Friday through Monday.
• highs 72-66 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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