Check out my latest Eugene Daily News Weather Or Not Column Middle Schoolers Rule! Two Of The Best Hours I’ve Ever Spent.

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Sorry, no winner this week. Here is my weekly weather quiz question for the last time this week. What is “air stagnation?” Here is the correct answer. Air Stagnation is a meteorological situation in which there is a major buildup of air pollution in the atmosphere. This usually occurs when the same air mass is parked over the same area for several days. During this time, the light winds cannot “cleanse” the buildup of smoke, dust, gases, and other industrial air pollution. 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 Tenmile Lakes in Coos County, Fern Ridge Reservoir, Lost Creek Lake,  and  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 low (Shaded “U” shape) is sliding through the Pacific Northwest bringing colder air and some blustery conditions along with the chance of rain. Be prepared for the chance of wet weather Thursday so your “Trick-or-Treaters” stay warm and dry.

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

• Mostly cloudy with a good (50%) chance of showers tonight (under 0.10 in. of rain possible),
• Patchy AM fog with a slight (20%) chance of showers, a mix of clouds and sun Monday afternoon, mostly clear with areas of frost and patchy fog late Monday night and early Tuesday AM, mostly sunny Tuesday afternoon, partly cloudy with areas of frost and patchy fog late Tuesday night.
• Patchy AM fog, a mix of clouds and sun Wednesday afternoon, then becoming mostly cloudy with a slight (20%) chance of rain Wednesday night.
• lows 35-28 warming to 44 Wednesday night highs 55-52.
• Mostly cloudy with a (40%) chance of rain Thursday (Halloween), a slight (20%) chance of rain Thursday night,
• A mix of clouds and sun with a slight (20%) chance of rain Friday, mostly cloudy with a (30%) chance of rain Friday night,
• Then mostly cloudy with a good (50%) chance of rain Saturday through Sunday.
• highs 57-60 cooling back to 55 Sunday lows near 40. (seasonal averages high 60 low 40)

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

• Mostly cloudy with a (30%) chance of showers this evening, mostly cloudy late tonight,
• Partly cloudy Monday AM, sunny in the afternoon, mostly clear with areas of frost and patchy fog late Monday night,
• Patchy AM coastal fog while areas of morning frost and patchy fog inland, sunny Tuesday afternoon, mostly clear at night with patchy inland frost late Tuesday night,
• Partly cloudy with patchy frost Wednesday AM, mostly cloudy in the afternoon, then mostly cloudy with a slight (20%) chance of rain Wednesday night.
• lows 43-36 warming to near 45 Wednesday night highs near 56.
• Mostly cloudy with a (40%) chance of rain Thursday (Halloween), a slight (20%) chance of rain at night,
• Mostly sunny with a slight (20%) chance of rain Friday, mostly cloudy with a slight (20%) chance of rain at night,
• Then mostly cloudy with a good (50%) chance of rain Saturday through Sunday.
• highs 60-52 lows near 45. (seasonal averages high 59 low 45)

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Forecast for the Cascades of Lane County:

• Cloudy and colder with rain and snow showers tonight (0.10 in. of rainfall possible, 2 in. of snow possible),
• Cloudy with a good (50%) chance of AM rain and snow showers, breezy (wind: NE 15-25 mph), a mix of clouds and sun with a slight (20%) chance of rain and snow showers Monday afternoon, partly cloudy and colder Monday night,
• Mostly sunny Tuesday, mostly clear at night,
• Partly cloudy Wednesday, mostly cloudy with a slight (20%) chance of rain Wednesday night.
• snow level 4,500 ft. late tonight, 3,500 ft. Monday, free air freezing level 6,000 ft. Monday night, 6,000 ft. rising to 8,000 ft. Tuesday afternoon, 9,000 ft. Tuesday night,    8,000 ft. Wednesday, then snow level 8,000 ft. Wednesday night.
• lows 29-20 warming to 32 Wednesday night highs 36-50.
• Mostly cloudy with a good (50%) chance of rain Thursday (Halloween), partly cloudy with a slight (20%) chance of showers at night,
• Partly cloudy Friday, partly cloudy with a slight (20%) chance of rain at night,
• Mostly cloudy with a good (50%) chance of rain and snow Sunday.
• snow level 8,000 ft. Thursday, above 8,000 ft. Thursday night, free air freezing level 11,000 ft. Friday, snow level 8,000 ft. Friday night, then 7,500 ft. Saturday, 6,000 ft. at night, then 5,500 ft. Sunday.
• highs 47-53 cooling to 42 Sunday lows 32-28.