Here is my weekly weather quiz question. What is a “Thermal Low.” 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:

• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL  10 PM SUNDAY FOR  THE GREATER PORTLAND AREA AND THE GREATER VANCOUVER AREA, THE CENTRAL WILLAMETTE VALLEY, AND THE SOUTH WILLAMETTE VALLEY.
• AN AIR STAGNATION ADVISORY IS IN EFFECT  THROUGH 10 AM WEDNESDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, NORTHERN AND EASTERN KLAMATH COUNTY, THE KLAMATH BASIN, WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
• A Blue-Green Algae warning  remains in effect for Lost Creek Lake, and Willow Creek Reservoir (NE Oregon). 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 cya, notoxin 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 high pressure ridge ( Shaded “arch” shape) is sitting over us and will dry us out pretty much through New Year’s Day. A weak frontal system has broken through as the ridge  giving us the chance of some light precipitation. The ridge will regain strength and continue the dry weather, with maybe one exception, through New Year’s Day.

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Air Quality Index:

Eugene-Springfield: The Pollution Index is 36 in the Good category measuring Particulate Matter at Amazon Park, Eugene. Data courtesy of Lane Regional Air Protection Agency (LRAPA)

Oakridge: The Pollution Index is 44 in the Good category measuring Particulate Matter at Willamette Activity Center, Oakridge.  Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Home Wood Heating Advisory:

Eugene/Springfield: (YELLOW) Burning Cautioned Against.

Oakridge: (YELLOW) Burning Cautioned Against.

The use of Pellet stoves is always allowed.

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

• Mostly cloudy with, patchy fog late tonight,
• Areas of AM fog, sunny Saturday afternoon, mostly clear in the evening, partly cloudy with patchy fog late Saturday night,
• Partly cloudy with areas of AM patchy fog, sunny Sunday afternoon, mostly clear in the evening, then partly cloudy with areas of fog late Sunday night and Monday AM, mostly cloudy with patchy fog Monday afternoon, then partly cloudy with patchy fog Monday night.
• lows 37-34 warming to 38 Tuesday highs 50-55 cooling to near 50 Monday.
• Partly cloudy with patchy fog and a slight (20%) chance of showers Tuesday, partly cloudy Tuesday night (New Year’s Eve) and Wednesday (New Year’s Day) and Wednesday night,
• Just mostly cloudy Thursday, mostly cloudy with a slight (20%) chance of showers and patchy fog late Thursday night,
• Then mostly cloudy with areas of fog Friday.
• highs 50-57 cooling to 52 Friday lows near 38. (seasonal averages high 51 low 40)

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Forecast for the Cascades of Lane County:

• Mostly cloudy tonight,
• Mostly sunny Saturday and Sunday, clear Saturday night, partly cloudy Sunday night,
• A mix of clouds and sun Monday, then mostly cloudy at night.
• free air freezing level 7,000 ft. tonight, 6,500 ft. rising to 7,000 ft. Saturday afternoon, 7,000 ft. Saturday night, 9,000 ft. Sunday, 10,000 ft. Sunday night, 9,000 ft. Monday, then 7,500 ft. Monday night.
• lows 26-29 highs 42-45.
• A mix of clouds and sun with a slight (20%) chance of rain and snow Tuesday, mostly cloudy Tuesday night,
• A mix of clouds and sun Wednesday (New Year’s Day), just mostly cloudy Wednesday night through Thursday night,
• Then mostly cloudy with a slight (20%) chance of rain Friday.
• snow level 5,500 ft. Tuesday, free air freezing level 7,000 ft. Tuesday night, 7,500 ft. Wednesday and Wednesday night, 8,000 ft. Thursday and Thursday night, then snow level 7,500 ft. Friday.
• highs 40-47 cooling to near 40 Friday lows 28-32 cooling to 32 Thursday night.

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 high pressure ridge (Shaded “Arch” shape) has kept clear skies over Oregon cutting off the moisture feed, but now a weak low will slide by keeping the clouds around and holding the temperatures down.

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Your Saturday College Football Forecast: You might want to bundle up for either game as temperatures will remain below normal.

The Beavers vs Stanford at Reser Stadium: Kickoff 7:30 PM- Cloudy with a slight chance of evening sprinkles, temperature near 52 cooling into the 40s by the end of the game, wind: N5-10 mph and becoming light.

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

• Cloudy with areas of fog and off and on drizzle this AM, cloudy this afternoon, cloudy with areas of fog late tonight,
• Mostly cloudy with areas of AM fog, mostly cloudy with a slight (20%) chance of showers Sunday afternoon, mostly cloudy in the evening, partly cloudy with patchy fog late at night,
• Partly cloudy with patchy fog Monday AM, mostly sunny in the afternoon, then mostly clear with patchy fog late Monday night.
• highs 57-60 cooling to 56 Monday lows 42-29.
• Patchy AM fog, mostly sunny Tuesday, partly cloudy with patchy fog late Tuesday night,
• Patchy AM fog, a mix of clouds and sun Wednesday, cloudy with a slight (20%) chance of rain Wednesday night,
• Mostly cloudy with a slight (20%) chance of rain Thursday (Halloween) and Friday, cloudy with a slight (20%) chance of rain Thursday night.
• highs 45-49 lows 26-34. (seasonal averages high 60 low 40)

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

• Cloudy with AM fog, partly cloudy this afternoon, mostly cloudy with patchy fog  at night and a slight (20%) chance of coastal drizzle.
• Mostly cloudy with areas of AM fog and a slight (20%) chance of coastal drizzle, partly cloudy Sunday afternoon and at night,
• Mostly sunny Monday, then mostly clear Monday night.
• highs 57-60 lows 46-38.
• Mostly sunny Tuesday, partly cloudy at night,
• Mostly cloudy with a slight (20%) chance of rain Wednesday and Wednesday night,
• Mostly cloudy with a slight (20%) chance of rain Thursday (Halloween), partly cloudy with a slight (20%) chance of rain at night,
• Then just partly cloudy Friday.
• highs 60-56 warming to 60 Friday lows 42-45 cooling to 42 Thursday night. (seasonal averages high 59 low 45)

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Forecast for the Cascades of Lane County:

• Sunny today, mostly clear tonight,
• Mostly sunny Sunday AM, a mix of clouds and sun with a slight (20%) chance of showers in the afternoon, partly cloudy and colder with a slight (20%) chance of showers Sunday night,
• Partly cloudy Monday, then mostly clear Monday night.
• free air freezing level 11,000 ft. today, 10,000 ft. tonight, snow level above 8,000 ft. Sunday, 5,000 ft. late Sunday night, free air freezing level 5,000 ft. Monday, then 4,500 ft. Monday night.
• highs 60-37 lows 33-20.
• Mostly sunny Tuesday, partly cloudy at night and Wednesday, mostly cloudy with a slight (20%) chance of rain Wednesday night,
• Mostly cloudy with a slight (20%) chance of rain Thursday (Halloween), just mostly cloudy at night,
• Then partly cloudy Friday.
• free air freezing level 7,000 ft. Tuesday, 8,000 ft. Tuesday night, 10,000 ft. Wednesday, snow level 7,500 ft. Wednesday night, 8,000 ft. Thursday, then free air freezing level 10,000 ft. Thursday night and Friday.
• highs 45-48 lows 26-34.