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Check out my latest Eugene Daily News Weather Or Not Column I Wonder How The Dam Thing Works and my new Feature Story How Medical Science Changed My Life.

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We have a winner!

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Congratulations to Josh Foster for being the first person to post the correct answer my new weekly weather quiz question. Here is the question again. Please define “a warm occlusion” and no it has nothing to do with a dental overbite. Here is Josh’s correct answer: In a warm occlusion, the air mass overtaking the warm front is not as cool as the cold air ahead of the warm front, and rides over the colder air mass while lifting the warm air. There are both warm and cold occluded fronts. Josh wins a week of free personalized weather forecasts tailored to his needs. I’ll have a new weekly weather quiz question starting next 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.  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 disturbance (Small shaded area) is moving away from us and a frontal system fell apart as it pushed into the Pacific Northwest and another one is on the way to get here Monday. An upper level low (shaded area offshore in first graphic) will take control of our weather for early next week.

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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.

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

• Mostly clear tonight.
• AM clouds and patchy fog, mostly sunny and not quite as warm in the afternoon, partly cloudy in the evening, mostly cloudy Sunday night.
• Mostly cloudy with a slight (20%) chance of showers Monday (Labor Day) through Tuesday, then partly cloudy Tuesday night.
• lows 54-56 cooling to 52 Monday night and warming to 55 Tuesday night highs 82-76 warming to 79 Tuesday.
• Partly cloudy Wednesday and in the evening, mostly cloudy late at night,
• A mix of clouds and sun Thursday, then partly cloudy Thursday night through Saturday.
• highs 78-75 warming to 80 Saturday lows near 55. (seasonal averages high 81 low 50)

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Forecast for the Umpqua Basin including Roseburg:

• Clear this evening, partly cloudy tonight.
• Mostly cloudy in the AM, sunny Sunday afternoon, mostly clear in the evening, partly cloudy with a slight (20%) chance of showers late Sunday night.
• Partly cloudy with a slight (20%) chance of showers Monday (Labor Day) and Monday evening, mostly cloudy with a slight (20%) chance of showers at night.
• Partly cloudy with a slight (20%) chance of showers Tuesday, a (30%) chance of showers in the evening, then partly cloudy late Tuesday night.
• lows near 58 highs 84-82.
• Partly cloudy Wednesday and in the evening, mostly cloudy with a slight (20%) chance of showers late Wednesday night.
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy with a slight (20%) chance of showers Thursday afternoon,  partly cloudy Thursday night.
• Mostly sunny Friday and Saturday with mostly clear skies Friday night.
• highs near 82-85 lows near 58-56. (seasonal averages high 83 low 54)

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

• Clear this evening, mostly cloudy with patchy coastal fog late tonight.
• Mostly cloudy with patchy fog in the AM, sunny Sunday afternoon, partly cloudy in the evening, mostly cloudy with a good (50%) chance of coastal showers Sunday night while partly cloudy in the evening inland and mostly cloudy with a (30%) chance of showers late at night.
• Mostly cloudy with a slight (20%) chance of showers Monday (Labor Day), a (30%) chance of coastal showers while a slight (20%) chance of showers inland Monday night.
• Mostly cloudy with a (30%) chance of AM showers, partly cloudy with a (40%) chance of showers Tuesday, then partly cloudy with a slight (20%) chance of showers Tuesday night.
• lows 55-60 cooling to 55 Monday night and Tuesday night highs 67-70.
• Partly cloudy with a slight (20%) chance of showers Wednesday and Wednesday night. Mostly cloudy with a slight (20%) chance of showers Thursday AM, partly cloudy with a slight (20%) chance of showers in the afternoon, just partly cloudy Thursday night and Friday, mostly clear Friday night.
• Mostly sunny Saturday.
• highs near 69 lows near 55. (seasonal averages high 66 low 52)

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Forecast for the Cascades of Lane County:

• Mostly clear tonight.
• AM clouds, mostly sunny Sunday afternoon,  partly cloudy in the evening, mostly cloudy Sunday night.
• A mix of clouds and sun with a slight (20%) chance of showers Monday (Labor Day), partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers Monday night. A mix of clouds and sun with a slight (20%) chance of showers Tuesday, then partly cloudy with a slight (20%) chance of showers in the evening and just partly cloudy late Tuesday night.
• free air freezing level 16,000 ft. falling to 14,000 ft. late tonight, 14,000 ft. Sunday, 14,000 ft. falling to 13,000 ft. Sunday night, snow level above 8,000 ft. Monday through Tuesday evening, then free air freezing level 12,000 ft. late Tuesday night.
• lows 49-45 warming to 47 Tuesday night highs 74-66.

• Partly cloudy with a slight (20%) chance of afternoon showers Wednesday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers late Wednesday night.
• A mix of clouds and sun with a slight (20%) chance of showers Thursday, mostly cloudy with a slight (20%) chance of showers in the evening, partly cloudy with a slight (20%) chance of showers late Thursday night. Partly cloudy with a slight (20%) chance of showers Friday AM,  mostly sunny in the afternoon, mostly clear at night.
• Mostly sunny Saturday.
• snow level above 8,000 ft. Wednesday through Friday AM, free air freezing level 14,000 ft. Friday afternoon then 15,000 ft. Friday night and Saturday.
• highs 68-65 warming to 70 Saturday lows 47-44 warming to 48 Friday night.

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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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