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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:

There is a Blue-Green Algae warning that continues for Dexter Reservoir and Dorena Reservoir, and now Fern Ridge Reservoir has been added to the list. 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 (“U” shape with blue arrows) along the coast will continue to send disturbances our way including this frontal system that will move through the Pacific Northwest tonight. That will keep us in a cooler and potentially wet weather pattern for the week. Yet another frontal system will move into Oregon over the weekend.

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The Grass Pollen Count is listed as Absent at 0 and Tree pollen is Absent at 0 as of 8/22/13 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 cloudy with (30%) chance of showers this evening, a slight (20%) chance of showers late tonight.
• Mostly cloudy in the AM, partly cloudy Tuesday afternoon and evening, mostly cloudy late Tuesday night and Wednesday AM, a mix of clouds and sun in the afternoon, partly cloudy in the evening, mostly cloudy late Wednesday night  and Thursday AM, then a mix of clouds and sun with a slight (20%) chance of showers in the afternoon, partly cloudy in the evening, then mostly cloudy late Thursday night.
• lows 54-58 highs 83-85 cooling to near 80 Thursday.
• A mix of clouds and sun Friday, mostly cloudy at night and Saturday AM, a mix of clouds and sun in the afternoon, mostly cloudy with a slight (20%) chance of showers late Saturday night.
• Mostly cloudy with a slight (20%) chance of showers Sunday AM, a mix of clouds and sun with a slight (20%) chance of showers Sunday afternoon, mostly cloudy in the evening and partly cloudy Sunday night with a slight (20%) chance of showers.
• A mix of clouds and sun with a slight (20%) chance of showers Monday (Labor Day)
• highs 82-75 warming to 78 Monday lows 57-53. (seasonal averages high 82 low 50)

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Forecast for the Umpqua Basin including Roseburg:

• Partly cloudy tonight through Tuesday evening, mostly cloudy late at night.
• Mostly cloudy Wednesday, then partly cloudy in the evening, mostly cloudy Wednesday night.
• Mostly cloudy with a slight (20%) chance of rain Thursday afternoon, then partly cloudy with a slight (20%) chance of showers Thursday night.
• lows 57-62 highs 86-83.
• Partly cloudy with a slight (20%) chance of showers Friday, just mostly cloudy Friday night and Saturday, partly cloudy with a slight (20%) chance of rain in the evening, mostly cloudy with a slight (20%) chance of rain late Saturday night.
• Mostly cloudy with a (30%) chance of showers Sunday AM, partly cloudy with a (30%) chance of showers in the afternoon and evening, mostly cloudy with slight (20%) chance of showers Sunday night.
• Mostly cloudy with a slight (20%) chance of showers Monday AM (Labor Day), then partly cloudy with a slight (20% chance of showers Monday afternoon.
• highs 82-77 warming to 80 Monday lows 59-56. (seasonal averages high 83 low 55)

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

• Partly cloudy with a slight (20%) chance of rain this evening, mostly cloudy tonight with coastal fog and a slight (20%) chance of coastal rain late tonight.
• Mostly cloudy Tuesday with patchy AM coastal fog, mostly cloudy with a slight (20%) chance of coastal rain Tuesday night (under 0.10 in. of rain possible) and Wednesday, a slight (20%) chance of coastal rain Wednesday night (under 0.10 in. of rain possible) while a slight (20%) chance of inland rain late at night.
• Mostly cloudy with a slight (20%) chance of rain Thursday, then mostly cloudy with a slight (20%) chance of showers Thursday night.
• lows 55-58 cooling back to 55 Thursday night highs 70-68.
• Mostly cloudy with a slight (20%) chance of showers  Friday, just mostly cloudy Friday night and Saturday, a slight (20%) chance of showers in the evening, just mostly cloudy  late Saturday night.
• Mostly cloudy with a (30%) chance of showers Sunday AM with partly cloudy skies and a (30%) chance of showers in the afternoon, then mostly cloudy with a slight (20%) chance of showers Sunday night and Monday (Labor Day).
• highs near 66 lows 56-53. (seasonal averages high 66 low 53)

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Forecast for the Cascades of Lane County:

• Partly cloudy tonight and Tuesday AM, mostly sunny in the afternoon, partly cloudy with a slight (20%) chance of evening rain, partly cloudy Tuesday night through Wednesday night.
• A mix of clouds and sun with a slight (20%) chance of showers Thursday afternoon, then just partly cloudy Thursday night.
• free air freezing level 11,000 ft. tonight, 12,000 ft. Tuesday and Tuesday night, 13,000 ft. Wednesday and Wednesday night, snow level 8,000 ft. Thursday and Thursday night.
• lows near 46 highs 68-72 cooling to 69 .Thursday.
• A mix of clouds and sun with a slight (20%) chance of showers in the afternoon and evening and just mostly cloudy late at night for both Friday and Saturday,
• Partly cloudy with a slight (20%) chance of showers Sunday and Sunday evening, partly cloudy with a slight (20%) chance of showers late at night.
• A mix of clouds and sun with a slight (20%) chance of showers Monday (Labor Day).
• snow level above 8,000 ft. Friday through Monday.
• highs 69-63 lows 47-43.

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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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