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Check out my latest Eugene Daily News Weather Or Not Column Remember What Don Essig Always Says. Really?

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Here is my new weekly weather quiz question. What is a “wall cloud?”  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) is moving to the north away from us.  Now the upper airflow is moving from the south producing the chance of showers and thunderstorms as the upper low rides north. Another upper level low will move in along the coast continuing the normal to cooler than normal temperatures. The Eugene Celebration runs Friday through Sunday and so far the weather is looking pretty good. Look for cooler temperatures with just a slight chance of AM drizzle Saturday and a slight chance of a shower Sunday. With temperatures dropping from the heat we’ve been having to just a bit cooler than normal you will need to dress accordingly.

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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 a slight (20%) chance of showers and thunderstorms this evening (under 0.10 in. of rain possible), partly cloudy late tonight.
• Cloudy Friday AM, partly cloudy Friday afternoon and evening, cloudy late Friday night and Saturday, mostly cloudy Saturday night and Sunday, then partly cloudy Sunday night.
• lows 57-52 highs 82-76.
• Partly cloudy with a slight (20%) chance of showers Monday afternoon, partly cloudy with a slight (20%) chance of showers in the evening, mostly cloudy with a slight (20%) chance of showers late Monday night and Tuesday AM, a mix of clouds and sun in the afternoon, mostly cloudy with a slight (20%) chance of showers in the evening, mostly cloudy late Tuesday night and Wednesday AM, then a mix of clouds and sun Wednesday afternoon and Thursday while mostly cloudy Wednesday evening and partly cloudy late Wednesday night.
• highs near 80 lows near 52. (seasonal averages high 83 low 51)

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Forecast for the Umpqua Basin including Roseburg:

• Mostly cloudy with a (40%) chance of isolated thunderstorms this evening (under 0.10 in. of rain possible), areas of smoke again late tonight.
• Areas of smoke Friday, mostly cloudy in the AM, partly cloudy with areas in the afternoon and evening, mostly cloudy with patchy fog and areas of smoke late at night and Saturday AM, mostly cloudy with more smoke in the afternoon.
• Mostly cloudy with areas of smoke Saturday night.
• Areas of AM smoke, mostly cloudy Sunday afternoon and evening, then partly cloudy late Sunday night.
• lows 59-53 highs 83-76.
• Partly cloudy Monday, mostly cloudy Monday night through Wednesday, then partly cloudy Wednesday night and Thursday.
• highs near 82 lows 53-56 cooling to 54 Wednesday night. (seasonal averages high 84 low 55)

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

• Mostly cloudy tonight and Friday AM, partly cloudy in the afternoon, mostly cloudy with patchy fog late Friday night.
• Mostly cloudy with patchy AM fog and patchy drizzle, mostly cloudy with patchy lingering fog Saturday through Sunday night.
• lows 56-53 highs 69-66.
• Partly cloudy Monday, Monday night through Wednesday.
• Then partly cloudy Wednesday night and Thursday.
• highs near 67 lows 53-55. (seasonal averages high 66 low 53)

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Forecast for the Cascades of Lane County:

• Mostly cloudy with a good (50%) chance of thunderstorms this evening, a slight (20%) chance of showers and thunderstorms late tonight (0.25 in. of rain possible, more in storms).
• Partly cloudy Friday and Friday evening, mostly cloudy late at night.
• Mostly cloudy Saturday with a slight (20%) chance of showers in the afternoon and Saturday night.
• Cloudy with a slight (20%) chance of thunderstorms Sunday, mostly cloudy in the evening with a slight (20%) chance of showers, then partly cloudy with a slight (20%) chance of showers late Sunday night.
• free air freezing level 13,000 ft. tonight through Friday night, snow level above 8,000 ft. Saturday and Saturday night, free air freezing level 12,000 ft. Sunday, snow level above 8,000 ft. Sunday night.
• lows 49-43 warming to 46 Sunday night highs 72-62.
• Partly cloudy with with a slight (20%) chance of showers Monday through Tuesday AM, partly cloudy in the afternoon and Tuesday night, a mix of clouds and sun Wednesday, then partly cloudy Wednesday night and Thursday.
• snow level above 8,000 ft. Monday through Tuesday AM, free air freezing level 12,000 ft. Tuesday afternoon, 12,000 ft. rising to 13,000 ft. at night, then 13,000 ft. Wednesday through Thursday.
• Highs 66-70 falling to 66 Wednesday then warming to near 70 Thursday lows near 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.

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

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