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Check out my latest Eugene Daily News Weather Or Not Column What’s In A Name? It’s “Deja Vu” All Over Again.

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Here is my weekly weather quiz question. What is “Popcorn Convection?” 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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Advisories:

A Blue-Green Algae warning continues for Dexter Reservoir, Dorena Reservoir, and Fern Ridge Reservoir.  Water monitoring has confirmed the presence of blue-green algae that can produce toxins, state public health officials said. The algae levels are likely associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals. Swallowing or inhaling water droplets, as well as skin contact with water, should be avoided according to the authorities.

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An upper level low pressure trough (Shaded area “U” shape offshore) has taken control of our weather for a while giving us one more day with lots of sunshine, then a chance os showers and thunderstorms for your Thursday. Autumn begins at 1:44 PM Friday September 22nd. The chance of rain will increase when the low moves eastward across Oregon.

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The Grass Pollen Count is listed as Absent at 0 and Tree pollen is Low at 2 as of 8/27/13 according to Oregon Allergy Associates. The Season is over.

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

• Partly cloudy  tonight.
• A mix of clouds and sun Wednesday, partly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the evening, mostly cloudy with showers likely (60%) and a slight (20%) chance of thunderstorms late Wednesday night (0.15 in. of rain possible, more in storms).
• Mostly cloudy with showers likely (60%) and a (30%) chance of thunderstorms Thursday AM, a good (50%) chance of showers and a slight (20%) chance of thunderstorms Thursday afternoon and evening (0.15 in. of rain possible, more in storms), partly cloudy with a slight (20%) showers late Thursday night.
• Then partly cloudy Friday and Friday night.
• lows 57-50 highs 82-73 warming to 78 Friday.
• Partly cloudy Saturday AM, mostly sunny in the afternoon, partly cloudy Saturday night and Sunday AM, mostly sunny Sunday afternoon, Monday, and Tuesday, partly cloudy Sunday night and mostly clear Monday night.
• highs 80-84 cooling to near 80 Tuesday lows 50-57. (seasonal averages high 80 low 50)

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Forecast for the Umpqua Basin including Roseburg:

• Partly cloudy this evening, mostly cloudy tonight.
• Mostly cloudy with a slight (20%) chance of showers and thunderstorms Wednesday afternoon and Wednesday night (under 0.10 in. of rain possible).
• Mostly cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms Thursday AM, showers likely (60%) and a slight (20%) chance of thunderstorms in the afternoon and evening (0.10 in. of rain possible), partly cloudy late Thursday night (under 0.10 in. of rain possible).
• Partly cloudy Friday AM, sunny and warmer in the afternoon, mostly clear Friday night.
• Mostly sunny Saturday, mostly clear at night, partly cloudy Sunday through Monday night.
• Then sunny Tuesday.
• highs near 82-87 lows 55-60. (seasonal averages high 82 low 54)

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

• Mostly cloudy with patchy coastal fog late tonight.
• Mostly cloudy with patchy AM fog, mostly cloudy in the afternoon with a (30%) chance of  showers Wednesday night and patchy fog late.
• Mostly cloudy with patchy AM fog, mostly cloudy with a (40%) chance of coastal showers Thursday AM, partly cloudy with a good (50%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon while a (40%) chance of AM showers inland and showers likely (60%) with a slight (20%) chance of thunderstorms Thursday afternoon (0.10 in. of rain possible, more in storms), mostly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the evening, then just partly cloudy late Thursday night (under 0.10 in. or rain possible).
• Partly cloudy Friday, mostly clear at night.
• Mostly sunny Saturday through Tuesday with mostly clear nights
• highs near 70 lows 55-59. (seasonal averages high 66 low 52)

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Forecast for the Cascades of Lane County:

• Partly cloudy tonight. Partly cloudy with a slight (20%) chance of showers Wednesday afternoon, mostly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the evening, showers likely (60%) and a slight (20%) chance of thunderstorms late Wednesday night (0.10 in. of rain possible, more in storms) and Thursday AM, mostly cloudy with a good (50%) chance of showers and a slight (20%) chance of thunderstorms Thursday afternoon and evening, partly cloudy with a slight (20%) chance of showers late at night.
• Partly cloudy Friday and Friday night.
• snow level above 8,000 ft. tonight through Thursday night, free air freezing level 11,000 ft. rising to 12,000 ft. Friday afternoon, then 12,000 ft. rising to 13,000 ft. late Friday night.
• lows 47-40 warming to 45 Friday night highs 70-57 warming to 65 Friday .
• Partly cloudy Saturday AM, mostly sunny in the afternoon, partly cloudy at night.
• Mostly sunny Sunday, Monday, and Tuesday with mostly clear skies at night.
• free air freezing level 13,000 ft. rising to 14,000 ft. Saturday, 14,000 ft. rising to 15,000 ft. Saturday night, then 15,000 ft. Sunday through Tuesday.
• highs 68-73 lows 46-50.

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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 Eugene Daily News.com.

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