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Here is my new weekly weather quiz question. What is the first rule when driving in fog? 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 FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 9 AM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST.
• A Blue-Green Algae warning  has been cancelled for Tenmile Lakes in Coos County and for Fern Ridge Reservoir, the 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 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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The upper airflow has become a ridge of high pressure that will keep us milder for a while.   The inversion it is causing (warmer air trapped above the colder air) the dense fog that we’ve been seeing. A frontal system moved through the Pacific Northwest bringing clouds and the chance of light rain and drizzle with it. Colder air will sweep in behind it.

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Air Quality Index:

Eugene-Springfield: The Pollution Index is 29 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 58 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 Is Alowed.

Oakridge: (YELLOW) Burning Cautioned Against.

Pellet stoves are always allowed.

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

• Partly cloudy with areas of fog and freezing fog this AM, partly cloudy this afternoon and evening, mostly cloudy tonight,
• Cloudy with rain a (40%) chance of AM rain and snow, rain likely (70%) Friday afternoon, rain and just a bit warmer Friday night,
• Cloudy with a good (50%) chance of showers Saturday (0.15 in. of rain possible), mostly cloudy with a slight (20%) chance of rain at night.
• highs 34-46 lows 25-38 cooling to 34 Saturday night.
• Mostly cloudy with a slight (20%) chance of rain Sunday, cloudy with a (30%) chance of showers at night,
• Mostly cloudy with a (30%) chance of rain Monday, cloudy with a (30%) chance of rain at night,
• Mostly cloudy with a slight (20%) chance of rain Tuesday, partly cloudy with a slight (20%) chance of rain Tuesday night (Christmas Eve),
• Then a mix of clouds and sun with a slight (20%) chance of rain Wednesday (Christmas Day).
• highs near 47 lows 36-33. (seasonal averages high 45 low 33).

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

• Partly cloudy this AM, becoming mostly sunny this afternoon, partly cloudy in the evening, mostly cloudy with patchy fog and freezing fog late tonight,
• Cloudy with a good (50%) chance of coastal rain Friday while a good (50%) chance of rain and slight (20%) chance of light freezing rain Friday AM inland, a good (50%) chance of rain in the afternoon, rain likely (70%) Friday evening, rain late Friday night (under 0.10 in. of rain possible),
• Cloudy with a good (50%) chance of rain Saturday (0.50 in. of rain possible), mostly cloudy with a slight (20%) chance of evening rain, then areas of fog late at night.
• highs 46-52 lows 34-32 warming to 43 Friday night and Saturday night.
• Areas of AM fog, partly cloudy with a slight (20%) chance of rain Sunday and Sunday night with patchy fog late,
• Mostly cloudy with a (30%) chance of rain Monday, a slight (20%) chance of rain at night,
• Then mostly cloudy with areas of AM fog and late night fog Tuesday through Wednesday (Christmas Day).
• highs near 53 lows 40-35. (seasonal averages high 51 low 39)

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Forecast for the Cascades of Lane County:

• Partly cloudy this AM, mostly sunny this afternoon, partly cloudy in the evening, mostly cloudy late tonight,
• Cloudy with a good (50%) chance of snow Friday AM, snow likely (60%) in the afternoon, Friday night,
• Cloudy with a good (50%) chance of showers Saturday, then mostly cloudy with a (40%) chance of rain and snow Saturday night.
• free air freezing level at the surface today and tonight, snow level 5,000 ft. Friday afternoon, 6,500 ft. Friday night, 6,000 ft. Saturday, 5,000 ft. at night,
• highs 28-36 lows 21-32 cooling to 28 Saturday night.
• Mostly cloudy with a sight (20%) chance of rain Sunday and Sunday night,
• Mostly cloudy with a (40%) chance of rain Monday, a (40%) chance of rain and snow Monday night,
• Mostly cloudy with a slight (20%) chance of rain and snow Tuesday, partly cloudy with a slight (20%) chance of rain and snow Tuesday night (Christmas Eve),
• Then a mix of clouds and sun Wednesday (Christmas Day).
• snow level 6,000 ft. Saturday, 5,000 ft. Saturday night, 6,500 ft. Sunday, 7,000 ft. Sunday night, 6,500 ft. Monday, 6,000 ft. Monday night, then 4,500 ft. Tuesday.
• highs 40-38 lows 29-20.