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 going to follow closely behind the high pressure ridge (Shaded “Arch” shape with blue arrows) that was over us. A frontal system will move in between Sunday and Monday (position shown is Monday) bringing more clouds and a continued chance of precipitation.

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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 9 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 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:

• Clear this evening, mostly cloudy late tonight and Saturday (cooler), partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late Saturday night and Sunday AM, partly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon, partly cloudy in the evening, mostly cloudy late Sunday night,
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Monday, partly cloudy with a slight (20%) chance of evening showers, then mostly cloudy with a (30%) chance of evening showers late at night.
• lows near 60 highs 75-80.
• A mix of clouds and sun and a bit cooler Tuesday with a (30%) chance of AM showers, a bit cooler with a slight (20%) chance of afternoon showers, partly cloudy with a slight (20%) chance of showers in the evening, mostly cloudy with a slight (20%) chance of showers late Tuesday night,
• A mix of clouds and sun and a bit warmer Wednesday with a slight (20%) chance of AM showers, a (30%) chance of showers and thunderstorms in the afternoon, partly cloudy with a slight (20%) chance of evening showers and thunderstorms, mostly cloudy with a (30%) chance of showers late Wednesday night,
• Then a mix of clouds and sun and just a bit cooler Thursday with a (30%) chance of showers, partly cloudy with a (30%) chance of showers at night,
• Then just partly cloudy and a bit warmer Friday.
• highs 75-80 cooling to 76 Thursday warming to near 80 Friday lows near 55. (seasonal averages high 84 low 52)

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Forecast for the Umpqua Basin including Roseburg:

• Mostly clear with patchy smoke this evening, partly cloudy with more patchy smoke late tonight,
• Mostly cloudy with patchy smoke Saturday AM, partly cloudy and a bit cooler with patchy smoke in the afternoon and evening, mostly cloudy with patchy smoke and a slight (20%) chance of showers late Saturday night,
• Mostly cloudy with patchy smoke and a slight (20%) chance of showers Sunday AM, partly cloudy with more patchy smoke and a slight (20%) chance of showers in the evening, mostly cloudy with patchy smoke and a slight (20%) chance of showers late Sunday night.
• highs 85-83 lows near 60.
• Mostly cloudy with patchy smoke and a slight (20%) chance of showers and Monday AM, partly cloudy and a bit cooler with patchy smoke and a slight (20%) chance of showers in the afternoon, mostly cloudy with patchy smoke and a slight (20%) chance of evening thunderstorms, a slight (20%) chance of showers with more patchy smoke late Monday night,
• Mostly cloudy with a slight (20%) chance of showers Tuesday through Thursday, then partly cloudy with a slight (20%) chance of showers Thursday evening, then just partly cloudy late Thursday night and partly cloudy and warmer Friday.
• highs 82-87 lows near 58. (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 evening with a slight (20%) chance of isolated coastal thunderstorms and mostly cloudy late tonight while partly cloudy this evening inland and mostly cloudy late tonight,
• Mostly cloudy Saturday, mostly cloudy with a slight (20%) chance of showers Saturday night (under 0.10 in. of rain possible) and Sunday AM, mostly cloudy in the afternoon, partly cloudy inland in the evening and mostly cloudy with a slight (20%) chance of showers late Sunday night while a slight (20%) chance of coastal showers late Sunday night,
• Then mostly cloudy with a slight (20%) chance of showers Monday and Monday night.
• lows 58-56 highs near 66.
• Mostly cloudy with a slight (20%) chance of showers Tuesday (a bit warmer) through Thursday (a bit cooler) evening, then just partly cloudy late Thursday night and Friday.
• highs 70-66 warming back to 70 Friday lows near 56. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Partly cloudy and a bit cooler Saturday and in the evening, mostly cloudy with a slight (20%) chance of showers late at night,
• A mix of clouds and sun and a bit cooler Sunday with a slight (20%) chance of AM showers, a slight (20%) chance of showers and thunderstorms and a bit warmer in the afternoon, partly cloudy with a slight (20%) chance evening showers and thunderstorms, mostly cloudy with a (20%) chance of showers late Sunday night,
• A mix of clouds and sun Monday with a slight (20%) chance of AM showers, a slight (20%) chance of showers and thunderstorms in the afternoon, partly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, mostly cloudy with a (30%) chance of showers late Monday night.
• free air freezing level 13,000 ft. tonight, 12,000 ft. Saturday, then snow level above 8,000 ft. tonight through Monday night.
• lows 46-48 highs 73-69.
• A mix of clouds and sun and cooler Tuesday with a (30%) chance of AM showers, a bit cooler with a slight (20%) chance of showers and thunderstorms in the afternoon, partly cloudy with a slight (20%) chance of showers an thunderstorms in the evening, a slight (20%) chance of showers late Tuesday night,
• A mix of clouds and sun with a 40% chance of showers Wednesday AM, a bit warmer with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon, partly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the evening, a slight (20%) chance of showers late Wednesday night,
• A mix of clouds and sun and just a bit cooler Thursday with a slight (20%) chance of AM showers, just a bit warmer with a (30%) chance of showers and thunderstorms in the afternoon, partly cloudy with a (30%) chance of evening showers and thunderstorms, just partly cloudy Thursday night and Friday AM, then mostly sunny and warmer Friday.
• snow level above 8,000 ft. Tuesday through Thursday night, then free air freezing level 11,000 ft. Friday.
• highs 62-66 cooling to 64 Thursday warming to 70 Friday lows 44-47.

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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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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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.

________________

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).

________________

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.

____________

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Clear tonight,
• Mostly sunny and just a bit warmer Friday, partly cloudy at night,
  A mix of clouds and sun and bit a cooler Saturday, mostly cloudy with a good (50%) chance of evening rain, a slight (20%) chance of rain late Saturday night,
• A mix of clouds and sun Sunday with a (30%) chance of AM showers, a slight (20%) chance of afternoon showers, then mostly cloudy with a (30%) chance of showers Sunday night.
• lows 53-58 highs 85-78.
• A mix of clouds and sun with a (30%) chance of showers Monday, becoming mostly cloudy with a (30%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Monday night,
• A mix of clouds and sun with a slight (20%) chance of showers Tuesday, partly cloudy with a slight (20%) chance of evening showers, then just partly cloudy and a bit warmer late Tuesday night through Thursday.
• highs 76-84 lows 56-54. (seasonal averages high 84 low 52)

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Forecast for the Umpqua Basin including Roseburg:

• Mostly clear with patchy smoke tonight,
• Sunny and a bit warmer with patchy smoke Friday, mostly clear in the evening, becoming mostly cloudy with patchy smoke late Friday night and Saturday AM, partly cloudy and a bit cooler in the afternoon, partly cloudy with patchy smoke and a slight (20%) chance of showers in the evening, mostly cloudy with patchy smoke and a slight (20%) chance of showers late Saturday night,
• Mostly cloudy Sunday with patchy smoke, a slight (20%) chance of showers Sunday AM, just mostly cloudy with patchy smoke in the afternoon, more patchy smoke with a slight (20%) chance of showers  Sunday night.
• lows 57-60 highs 88-85.
• Mostly cloudy with patchy smoke and a slight (20%) chance of showers and thunderstorms Monday AM, patchy smoke a slight (20%) chance of thunderstorms in the afternoon, a slight (20%) chance of showers with more patchy smoke Monday night,
• Partly cloudy with patchy smoke and a slight (20%) chance of AM showers and thunderstorms, a slight (20%) chance of thunderstorms in the afternoon and at night Tuesday through Wednesday,
• Mostly cloudy with patchy smoke in the AM, partly cloudy and warmer with continuing patchy smoke and a slight (20%) chance of thunderstorms Thursday afternoon.
• highs 82-86 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 Friday AM, sunny in the afternoon, partly cloudy in the evening with a slight (20%) chance of evening coastal thunderstorms, mostly cloudy late Friday night,
• Mostly cloudy with a slight (20%) chance of coastal showers Saturday AM, just mostly cloudy in the afternoon (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Sunday and Sunday night.
• lows 56-58 highs near 67.
• Mostly cloudy with a slight (20%) chance of showers Monday and in the evening, then just partly cloudy late Monday night through Thursday.
• highs near 66 lows near 56. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Mostly sunny Friday, mostly clear at night,
• Partly cloudy and a bit cooler Saturday, a slight (20%) chance of showers in the evening, becoming mostly cloudy with a (40%) chance of rain late Saturday night,
• A mix of clouds and sun and a bit cooler Sunday with a (40%) chance of AM showers, a slight (20%) chance of showers and a bit warmer in the afternoon, a (30%) chance of showers Sunday night.
• free air freezing level 14,000 ft. tonight, 13,000 ft. Friday through Saturday, then snow level above 8,000 ft. Saturday night through Sunday night.
• lows 44-48 highs 74-66.
• A mix of clouds and sun with a (30%) chance of showers Monday AM, a (30%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon, mostly cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms in the evening, partly cloudy with a slight (20%) chance of showers late Monday night,
• A mix of clouds and sun Tuesday with a (30%) chance of AM showers, a slight (20%) chance of showers and thunderstorms in the afternoon, partly cloudy with a slight (20%) chance of evening showers and thunderstorms, a slight (20%) chance of showers late Tuesday night and Wednesday AM, a bit warmer with a slight (20%) chance of afternoon and evening showers and thunderstorms, a slight (20%) chance of showers late Wednesday night,
• Partly cloudy with a slight chance of AM showers, then just a bit warmer with a slight (20%) chance of showers and thunderstorms Thursday afternoon.
• snow level above 8,000 ft. Monday through Thursday.
• 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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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