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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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Sorry, but no winner this week. Here is my weekly weather quiz question for the last time. What is “Popcorn Convection?” Here is the correct answer. Popcorn Convection is slang for showers and thunderstorms that form on a scattered basis with little or no apparent organization, usually during the afternoon in response to diurnal heating. Individual thunderstorms typically are of the type sometimes referred to as air-mass thunderstorms: they are small, short-lived, very rarely severe, and they almost always dissipate near or just after sunset. I’ll have a new weekly weather quiz question for you starting Monday. 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, and farther away at Devils Lake.  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 high pressure ridge shaded “Arch” shape has taken over our weather for a short while, then another upper level low pressure trough will move toward the Oregon coast to replace it. That change may take place late in the week or the weekend. Autumn begins at 1:44 PM Friday September 22nd, so Summer is nearly over.

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The Grass Pollen Count is listed as Low at 2 and Tree pollen is Absent at 0 as of 8/31/13 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:

• Patchy AM fog, sunny and warmer this afternoon, clear tonight.
• Partly cloudy Monday AM, sunny in the afternoon, then clear Monday night.
• Sunny Tuesday, then clear at night.
• highs 85-92 lows 54-52 warming to near 60 Tuesday night.
• Sunny Wednesday, mostly clear Wednesday night.
• Mostly sunny Thursday, partly cloudy Thursday night through Friday evening, mostly cloudy late at night and Saturday AM, then partly cloudy Saturday afternoon.
• highs 89-75 lows 57-52. (seasonal averages high 79 low 49)

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

• Mostly cloudy with patchy AM coastal fog, sunny this afternoon, mostly clear at night.
• Sunny Monday, mostly clear at night.
• Mostly sunny Tuesday, then mostly clear Tuesday night.
• highs 70-75 lows 57-60.
• Mostly sunny Wednesday, mostly clear at night.
• Partly cloudy Thursday AM, sunny Thursday afternoon, mostly clear in the evening, mostly cloudy with patchy fog late Thursday night and Friday AM, partly cloudy Friday afternoon.
• Then mostly cloudy Friday night and Saturday.
• highs 73-68 lows 58-56. (seasonal averages high 66 low 51)

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Forecast for the Cascades of Lane County:

• Sunny today through Tuesday with clear nights.
• free air freezing level 15,000 ft. today and tonight , 15,000 ft. falling to 14,000 ft. Monday, 14,000 ft. rising to 15,000 ft. late Monday night, 15,000 ft. rising to 16,000 ft. Tuesday and Tuesday night.
• highs 74-85 lows 49-58.
• Sunny Wednesday, mostly clear at night.
• Mostly sunny Thursday AM, partly cloudy in the afternoon and Thursday night.
• Partly cloudy with a slight (20%) chance of showers and thunderstorms Friday afternoon through Friday evening, partly cloudy with a slight (20%) chance of showers late Friday night and Saturday AM, then just partly cloudy Saturday afternoon.
• free air freezing level 15,000 ft. Wednesday through Thursday, 15,000 ft. falling to 14,000 ft. Thursday night and Friday AM, snow level above 8,000 ft. Friday afternoon through Saturday.
• highs 82-67 lows 53-44.

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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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