Here is my 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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An Omega Blocking high pressure ridge (Shaded “Arch” shaped like the Greek letter Omega with blue arrows) is settling over the Pacific Northwest. Cold Canadian air has dried us out and given us the coldest temperatures of the season so far, particularly at night. Remember to be careful in the mountains due to the new snowfall and potentially icy driving conditions.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

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

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Advisories:

• A HARD FREEZE WARNING IS IN EFFECT FROM 10 PM TONIGHT UNTIL 9 AM THURSDAY FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY,  AND JACKSON COUNTY.
• A HARD FREEZE WARNING IS IN EFFECT FROM 10 PM THURSDAY UNTIL 9 AM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A FROST ADVISORY IS IN EFFECT FROM 10 PM THURSDAY UNTIL 9 AM FRDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• 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:

• Clear and cold with patchy freezing fog late tonight,
• Patchy AM freezing fog, sunny Thursday (Thanksgiving Day), clear and cold Thursday night,
• Sunny Friday and Saturday, clear and cold at night,
• lows 22-26 highs near 42.
• Sunny Sunday, mostly clear at night,
• Partly cloudy Monday, mostly cloudy with a (30%) chance of rain Monday night,
• Mostly cloudy with a (40%) chance of rain Tuesday, then mostly cloudy with a good (50%) of rain Tuesday night and Wednesday.
• highs 42-47 lows 28-37. (seasonal averages high 49 low 36)

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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: Sunny and cool, 35 warming 42 by the end of the game, wind NE 5-10 mph gusts to 20 mph. You should bundle up that’s pretty chilly.

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Forecast for Roseburg:

• Mostly clear and colder with patchy freezing fog late tonight,
• Patchy AM freezing fog, sunny Thursday afternoon (Thanksgiving Day), clear with patchy freezing fog late at night and Friday AM, sunny in the afternoon, clear Friday night,
• Sunny Saturday, then clear at night.
• lows 24-27 highs near 42.
• Sunny Sunday, partly cloudy Sunday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Monday,then mostly cloudy with a (40%) chance of rain Monday night through Wednesday.
• highs 42-50 lows 28-37. (seasonal averages high 50 low 39)

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

• Mostly clear and cold tonight,
• Sunny and a bit warmer Thursday (Thanksgiving Day), Friday and Saturday, clear each night.
• lows 29-34 highs 46-52.
• Sunny Sunday, partly cloudy Sunday night,
• Mostly cloudy with a slight (20%) chance of rain Monday, then mostly cloudy with a (40%) chance of rain Monday night through Wednesday.
• highs 50-54 lows 36-44. (seasonal averages high 53 low 41).

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Forecast for the Cascades in Lane County:

• Partly cloudy and very cold tonight,
• Sunny Thursday (Thanksgiving Day) and Friday, clear and cold both nights,
• Mostly sunny Saturday, mostly clear and cold at night.
• free air freezing level at the surface tonight through Thursday night, 3,500 ft. Friday, at the surface Friday night, at the surface Saturday, then 4,500 ft. Saturday night.
• lows 10-14 cooling to 12 Friday night highs 28-30 cooling back to 28 Saturday night.
• Mostly sunny and a bit warmer Sunday, partly cloudy Sunday night,
• Partly cloudy Monday, mostly cloudy with a (30%) chance of rain and snow at night,
• Then mostly cloudy and a bit warmer with a (40%) chance of rain and snow Tuesday, then mostly cloudy with a good (50%) chance of rain and snow Tuesday night and Wednesday.
• free air freezing level 4,000 ft. Sunday and Sunday night, 6,000 ft. Monday, snow level 5,500 ft. Monday night, 6,000 ft. Tuesday, 5,500 ft. Tuesday night, then 6,000 ft. Wednesday.
• highs 32-38 lows 17-30.

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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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