Here is my new weekly weather quiz question. What is a “Temperature Inversion?” 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 WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM THURSDAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES OF LANE COUNTY.

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An upper level high pressure ridge ( Shaded “arch” shape) is going to keep sending waves of moisture at us. A frontal system is on its way to spread more rain over the Pacific Northwest. More storms will push in with the strongest frontal system coming through Oregon on Saturday increasing our chances for rain even more.

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Air Quality Index:

Eugene-Springfield: The Pollution Index is 15 in the Good category measuring Particulate Matter at Springfield City Hall. Data courtesy of Lane Regional Air Protection Agency (LRAPA)

Oakridge: The Pollution Index is 87 in the Moderate 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: (GREEN) Burning Allowed.

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:

• Coastal rain this evening and rain likely (60%) late tonight while rain inland tonight  (0.30 in. of rain possible) and breezy (Wind: SW 15-25 mph shifting to W 10-15 mph late at night),
• Cloudy with a good (50%) chance of AM showers, showers Thursday afternoon (0.10 in. of rain possible), mostly cloudy with a (40%) chance of rain Thursday night (0.10 in. of rain possible) and breezy (Wind: SW 15-25 mph decreasing to SW 10-15 mph late at night),
• Mostly cloudy with a (40%) chance of showers Friday afternoon (0.10 in. of rain possible) and evening, rain late Friday night (0.50 in. of rain possible) and windy (Wind: S 15-25 mph increasing to S 25-35 mph late at night at the coast while S 15-25 mph gusts to 45 mph inland late at night).
• Rain and windy Saturday, showers likely (70%) in the evening, then a good (50%) chance of showers at night.
• lows 43-46 cooling to 42 Saturday night highs near 52.
• Mostly cloudy with a good (50%) chance of showers Sunday, a slight (20%) chance of showers at night,
• Mostly cloudy with patchy AM fog and late night fog and lingering afternoon fog  Monday through Tuesday night,
• Then sunny Wednesday.
• highs 50-55 Monday lows 39-36. (seasonal averages high 51 low 40)

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Forecast for the Cascades of Lane County:

• Rain and snow this evening, rain and snow showers (0.50 in. of  rain possible, 2-5 in. of snow possible) and breezy (SW 15-25 mph gusts to 40 mph decreasing to W 10-15 mph Gusts to 30 mph late tonight) tonight,
• AM rain and snow showers likely (60%), rain and snow in the afternoon (0.25 in. of rain possible, 1-3 in. of snow possible), rain and snow Thursday night (0.10 in. of rain possible, 1-3 in. of snow possible),
• Cloudy with AM rain and snow likely (60%), a good (50%) chance of afternoon rain, then cloudy with a good (50%) chance of rain Friday night,
• AM rain, rain and snow Saturday afternoon and breezy, rain and snow showers Saturday night.
• snow level 5,000 ft. falling to 4,000 ft. tonight, 3,000 ft. Thursday, 3,500 ft. rising to 5,000 ft. late Thursday night, 5,000 ft. Friday, 7,000 ft. Friday night, 6,5000 ft. falling to 4,500 ft. Saturday, then 2,500 ft. Saturday night.
• lows 27-36 cooling to 25 Saturday night highs 33-42 cooling to 36 Saturday.
• Cloudy with a (50%) chance of rain and snow showers Sunday, a (30%) chance of rain and snow showers Sunday night,
• Then a mix of clouds and sun with a slight (20%) chance of rain and snow showers Monday, mostly cloudy at night,
• A mix of clouds and sun Tuesday, then partly cloudy Tuesday night and Wednesday.
• snow level 2,500 ft. Sunday, 4,000 ft. Sunday night, 5,000 ft. Monday, free air freezing level 6,500 ft. at night, 8,000 ft. Tuesday, 9,000 ft. at night, then 8,000 ft. Wednesday.
• highs 32-43 lows 26-33.