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 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 (30%) chance of rain or drizzle this AM, showers likely (70%) this afternoon and evening (under 0.10 in. of rain possible), mostly cloudy and colder with a (40%) chance of showers tonight,
• Patchy AM fog, partly cloudy Monday afternoon,  mostly clear with areas of frost and patchy frost late Monday night and early Tuesday AM, mostly sunny Tuesday afternoon, then partly cloudy Tuesday night.
• highs 53-56 lows 37-29 warming to 33 Tuesday night.
• Partly cloudy Wednesday, mostly cloudy with a slight (20%) chance of rain Wednesday night,
• Mostly cloudy with a slight (20%) chance of rain Thursday (Halloween) and Thursday night,
• Partly cloudy Friday, mostly cloudy Friday night,
• Then mostly cloudy with a slight (20%) chance of rain Saturday.
• highs 57-60 cooling back to 57 Saturday 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 areas of AM fog and a slight (20%) chance of coastal drizzle, a slight (20%) chance of afternoon coastal drizzle and a (40%) chance of inland afternoon showers today, mostly cloudy with a slight (20%) chance of showers this evening, then partly cloudy late tonight,
• Partly cloudy Monday AM, sunny in the afternoon, mostly clear with patchy fog late Monday night,
• Patchy AM fog, sunny Tuesday, then mostly clear at night.
• highs near 55 lows 43-38 warming to near 40 Tuesday night.
• Mostly cloudy Wednesday, mostly cloudy with a slight (20%) chance of rain Wednesday night,
• A (40%) chance of rain Thursday (Halloween), mostly cloudy with a slight (20%) chance of rain at night,
• Partly cloudy Friday, partly cloudy with a slight (20%) chance of rain at night,
• Then mostly cloudy with a slight (20%) chance of rain Saturday.
• highs 57-60 cooling to 54 Saturday lows 44-47. (seasonal averages high 59 low 45)

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Forecast for the Cascades of Lane County:

• Partly cloudy with a slight (20%) chance of AM rain and drizzle, rain and snow showers this afternoon (0.10 in. of rain possible), cloudy and colder rain and snow showers tonight (0.10 in. of rainfall possible, 2 in. of snow possible),
• Mostly cloudy with a (30%) 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.
• snow level 8,000 ft. falling to 4,000 ft. this afternoon, 4,500 ft. late tonight, 3,500 ft. Monday, free air freezing level 5,500 ft. falling to 4,500 ft. Monday night, 6,000 ft. rising to 8,000 ft. Tuesday afternoon, then 8,000 ft. Tuesday night.
• highs 43-37 warming to 46 Tuesday lows 29-20 warming to 26 Tuesday night.
• Partly cloudy Wednesday, mostly cloudy with a slight (20%) chance of rain Wednesday night,
• A mix of clouds and sun with a slight (20%) chance of rain Thursday (Halloween), just partly cloudy at night,
• Mostly sunny Friday, partly cloudy at night,
• Then a mix of clouds and sun Saturday.
• free air freezing level  8,000 ft. Wednesday, snow level 7,500 ft. Wednesday night, above 8,000 ft. Thursday, free air freezing level 11,000 ft. Thursday night through Friday night, then 10,000 ft. Saturday.
• highs 44-50 cooling to 48 Saturday lows near 33.