Here is my new weekly weather quiz question. What is “the chromosphere?” 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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A sprawling high pressure ridge (Shaded “Arch” shape with blue arrows) sitting just east of  us kept us cool and dry today. A strong cold front is on its way here from the northwest. It will bring back the chance of precipitation and behind it a mass of cold air that will drop snow levels in the area down to about 1,000 ft. No snow expected for the Willamette Valley, yet anyway. An upper level low (Shaded “U” shape with blue arrows) will replace the high continuing the wet weather pattern through the Pacific Northwest.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 39 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 38 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 1 AM UNTIL 10 PM TUESDAY  FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM TUESDAY UNTIL 10 AM WEDNESDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 1 AM TUESDAY UNTIL 4 AM WEDNESDAY FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JEFFERSON COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY.
• A HEALTH ADVISORY CONTINUES FOR SUNSET BAY STATE PARK BEACH LOCATED IN COOS COUNTY FOR HIGHER-THAN-NORMAL FECAL BACTERIA WHICH CAN RESULT IN DIARRHEA, STOMACH CRAMPS, SKIN RASHES, UPPER RESPIRATORY INFECTIONS AND OTHER ILLNESSES. DIRECT CONTACT WITH THE WATER – ESPECIALLY BY CHILDREN AND THE ELDERLY, WHO MAY BE VULNERABLE TO WATERBORNE BACTERIA – SHOULD BE AVOIDED IN THIS AREA UNTIL THE ADVISORY IS LIFTED. VISITORS SHOULD AVOID WADING IN NEARBY CREEKS, POOLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.

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

• More clouds to mostly cloudy with a slight (20%) chance of rain and a bit warmer this afternoon (under 0.10 in. of rain possible), rain tonight (0.50 in. of rain possible),
• Mostly cloudy and cooler with showers likely (70%) Tuesday, (0.15 in. of rain possible), a good (50%) chance of evening showers (under 0.10 in. of rain possible), a slight (20%) chance of showers late Tuesday night,
• AM clouds, mostly sunny and a bit cooler Wednesday, then just clear and cold Wednesday night.
• highs 48-42 lows 37-22.
• Sunny Thursday (Thanksgiving Day), Friday, and Saturday, clear each night,
• Then mostly sunny Sunday.
• highs 40-42 lows 23-26. (seasonal averages high 50 low 37)

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Your College Football Forecast:

The Civil War Game Friday November 27th:

Ducks vs Beavers at Autzen Stadium – Kickoff 1:00 PM PST: Preliminary forecast: Sunny and cool, 35 warming 40 by the end of the game. You should bundle up that’s pretty chilly.

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Forecast for Roseburg:

• Mostly cloudy and a bit warmer with a slight (20%) chance of rain this afternoon, evening rain, rain and colder late tonight (0.25 in. of rain possible),
• Mostly cloudy with showers, snow likely (70%) with a slight (20%) chance of thunderstorms Tuesday AM, rain and snow showers with a slight (20%) chance of thunderstorms and colder in the afternoon (0.20 in. of rain possible, 1-2 in. of snow possible, snow level 2,000 ft.), cloudy with a (40%) chance of rain and snow showers and colder Tuesday night (under 0.10 in. of rain possible, snow level 2,000 ft. falling to 1,000 ft. late),
• Partly cloudy with a slight (20%) chance of AM snow showers, just partly cloudy and a bit cooler Wednesday afternoon, then mostly clear and colder Wednesday night.
• highs 55-40 lows 42-24.
• Sunny Thursday (Thanksgiving Day), Friday, and Saturday, clear Thursday night and Friday night, mostly clear Saturday night,
• Then mostly sunny Sunday.
• highs 42-45 lows 25-28. (seasonal averages high 51 low 39)

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

• Mostly cloudy with a slight (20%) chance of rain and cooler this afternoon (under 0.10 in. of rain possible), rain tonight (0.40 in. of rain possible, snow level 2,000 ft. late),
• Mostly cloudy with showers likely (70%) and a slight (20%) chance of thunderstorms Tuesday AM, coastal showers and a slight (20%) chance of showers thunderstorms and cooler in the afternoon while inland showers and snow showers with a slight (20%) chance of thunderstorms in the afternoon (0.25 in. of rain possible), a (30%) chance of coastal showers Tuesday night while inland evening showers likely (70%) and a good (50%) chance of inland showers late Tuesday night (under 0.10 in. of rain possible),
• Partly cloudy Wednesday, then clear at night.
• highs 55-45 lows 42-33.
• Sunny and a bit warmer Thursday (Thanksgiving Day), clear Thursday night,
• Then sunny Friday through Sunday, clear each night.
• highs 46-52 lows 35-39 cooling to 37 Saturday night. (seasonal averages high 53 low 42).

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Forecast for the Cascades in Lane County:

• Partly cloudy and a bit cooler this afternoon, mostly cloudy with rain and snow tonight (0.50 in. of rain possible, 2-6 in. of snow possible),
• Mostly cloudy with snow showers and much colder Tuesday (2-3 in. of snow possible), cloudy with  evening snow showers likely (70%), a good (50%) chance of rain and snow showers Tuesday night,
• Partly cloudy with a slight (20%) chance of snow showers and a bit cooler Wednesday, then becoming mostly clear at night.
• free air freezing level 9,000 ft. falling to 6,000 ft. this afternoon, snow level 5,000 ft. falling to 3,500 ft. late tonight, at the surface Tuesday through Wednesday, then free air freezing level at the surface Wednesday night.
• highs 43-24 lows 24-10.
• Sunny Thursday (Thanksgiving Day) and Friday, clear both nights,
• Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
• free air freezing level at the surface Thursday through Sunday.
• highs 26-32 lows near 15.

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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