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:

• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL  NOON TODAY 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 FREEZING FOG ADVISORY IS IN EFFECT  UNTIL 10 AM TODAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A Blue-Green Algae warning has been cancelled for Lost Creek Lake, the warning remains in effect for 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. This will be the last time this bulletin will be published until other Blue-Green Algae warnings are issued.

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An upper level high pressure ridge ( Shaded “arch” shape) is strengthening again. It will weaken a bit today into Tuesday allowing a weak disturbance to slip through for possible sprinkles. The ridge will regain strength and continue the dry weather through New Year’s Day, then a frontal system will bring another chance of precipitation between Thursday and Friday.

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Air Quality Index:

Eugene-Springfield: The Pollution Index is 34 in the Good category measuring Particulate Matter at HWY 99, Eugene. Data courtesy of Lane Regional Air Protection Agency (LRAPA)

Oakridge: The Pollution Index is 49 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 areas of AM fog, patchy fog this afternoon, patchy evening coastal fog and areas of fog late while patchy inland fog late tonight,
• Mostly cloudy with patchy fog and a slight (20%) chance of AM coastal and inland rain, partly cloudy with patchy fog Tuesday afternoon, mostly cloudy with patchy fog Tuesday night (New Year’s Eve).
• Mostly cloudy with patchy fog Wednesday (New Year’s Day) and Wednesday night.
• highs 55-50 lows near 38.
• Mostly cloudy with patchy fog Thursday, a (30%) chance of rain with patchy fog late Thursday night,
• Mostly cloudy with a (30%) chance of rain Friday, mostly cloudy with a slight (20%) chance of rain Friday night and Saturday, a (30%) chance of rain Saturday night,
• Then mostly cloudy with a slight (20%) chance of rain Sunday.
• highs 54-50 warming to near 54 Saturday lows 37-43 cooling to 35 Friday night. (seasonal averages high 51 low 40)

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Forecast for the Cascades of Lane County:

• A mix of clouds and sun today, mostly cloudy tonight,
• Mostly cloudy with a slight (20%) chance of rain Tuesday afternoon, mostly cloudy at night (New Year’s Eve),
• A mix of clouds and sun Wednesday (New Year’s Day), then partly cloudy Wednesday night.
• free air freezing level 10,000 ft. falling to 9,000 ft. this afternoon, 8,000 ft. tonight, snow level 6,000 ft. Tuesday, free air freezing level 7,000 ft. Tuesday night, 9,000 ft. Wednesday, then 7,500 ft. Wednesday night.
• highs near 39 lows 27-33.
• A mix of clouds and sun Thursday, mostly cloudy with a slight (20%) chance of rain at night,
• Mostly cloudy with a (40%) chance of rain Friday, a slight (20%) chance of rain and snow Friday night,
• A mix of clouds and sun with a slight (20%) chance of rain and snow Saturday, mostly cloudy with a good chance of rain and snow at night,
• Then mostly cloudy with a (40%) chance of rain and snow Sunday.
• snow level 7,000 ft. Thursday, 7,000 ft. at night, 6,000 ft. Friday, 4,000 ft. Friday night through Saturday night, then 4,500 ft. Sunday.
• highs 43-35 lows 32-24.