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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 UNTIL 8 AM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 2 AM UNTIL 3 PM FRIDAY FOR THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, AND THE UPPER HOOD RIVER VALLEY.
• A FROST ADVISORY IS IN EFFECT UNTIL 8 AM FRIDAY FOR THE CURRY COUNTY 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 in colder air for a day or two.. 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 47 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 36 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: (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:

• Mostly cloudy with a slight (20%) chance of snow tonight,
• Cloudy with rain, sleet, snow, and a (30%) chance of freezing rain in the AM, rain in the afternoon (0.25 in. of rain possible), rain and just a bit warmer Friday night,
• Cloudy with a good (50%) chance of rain Saturday (0.15 in. of rain possible)and Saturday night,
• Mostly cloudy with a (30%) chance of rain Sunday, then cloudy with a slight (20%) chance of rain at night.
• lows 29-40 cooling to 38 Sunday night highs 47-44 warming to  cooling to 42 Sunday.
• Mostly cloudy with a (40%) chance of rain Monday and Monday night.
• A mix  of clouds and sun Tuesday, mostly clear at night (Christmas Eve),
• Partly cloudy Wednesday (Christmas Day), Wednesday night and Thursday.
• highs 44-47 cooling to  to 44 Thursday lows 36-29. (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 evening, mostly cloudy with patchy fog and a (30%) chance of coastal rain late while a (30%) chance of rain and brief freezing rain late tonight,
• Mostly cloudy with rain likely (60%) Friday, rain in the evening ands Friday night (under 0.10 in. of rain possible),
• Cloudy with a (40%) chance of showers Saturday (0.50 in. of rain possible), mostly cloudy with a slight (20%) chance of evening showers, areas of fog late at night,
• Areas of AM fog, mostly cloudy Sunday, a slight (20%) chance of rain with patchy fog late Sunday night.
• lows 36-44 cooling to 39 Sunday night highs 50-54.
• Mostly cloudy with a (30%) chance of rain Monday and at night,
• A slight (20%) chance of showers Tuesday, then partly cloudy with areas of fog  through Wednesday (Christmas Day), partly cloudy with areas of fog Wednesday night and Thursday.
• 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 evening, mostly cloudy with a slight (20%) chance of light snow late tonight,
• Cloudy with a chance of rain and snow Friday, cloudy with rain and snow Friday, (0.25 in. of rain possible, 1-4 in. of snow possible), rain Friday night (0.50 in. of rain possible),
• Rain and snow likely (70%) Saturday, mostly cloudy with a (40%) chance of rain and snow Saturday night, then a slight (20%) chance of rain Sunday and Sunday night.
• free air freezing level at the surface this evening, snow level 6,000 ft. Friday afternoon, at the surface at night, 6,000 ft. Saturday, 4,500 ft. Saturday night, 7,500 ft. Sunday, then 7,000 ft. Saturday night.
• lows 21-30 cooling to 28 Saturday night warming to 32 Sunday night highs 37-45.
• Mostly cloudy with a (40%) chance of rain and snow Monday, a good (50%) chance of rain and snow Monday night,
• Partly cloudy with a slight (20%) chance of rain and snow Tuesday, partly cloudy  Tuesday night (Christmas Eve),
• Then mostly sunny Wednesday (Christmas Day) and Thursday with partly cloudy skies Wednesday night.
• 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 38-32 warming to 42 Thursday lows 24-29.