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 upper level low (Shaded “U” shape with blue arrows) is moving eastward with cold high pressure (Shaded “Arch” shape) moving in to settle over the Pacific Northwest. A frontal system has been pushed down at us from the northwest. Behind that front is cold Canadian air that will dry us out and give us the coldest temperatures of the season so far, particularly at night.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 24 in the Good category measuring Particulate Matter.

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

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Advisories:

• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM WEDNESDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A HARD FREEZE WARNING IS IN EFFECT FROM 10 PM WEDNESDAY 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 FROST ADVISORY IS IN EFFECT FROM 10 PM WEDNESDAY  UNTIL 9 AM THURSDAY FOR THE CURRY COUNTY COAST.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM WEDNESDAY  FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM WEDNESDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM TODAY 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:

• Mostly cloudy with a good (50%) chance of evening showers, a slight (20%) chance of showers late tonight with patchy freezing fog late (under 0.10 in. of rain possible),
• Partly cloudy with patchy AM freezing fog, partly cloudy and a bit cooler Wednesday afternoon, clear and cold Wednesday night,
• Sunny Thursday (Thanksgiving Day) and Friday, clear both nights.
• lows 29-23 highs near 42.
• Sunny Saturday and Sunday, mostly clear each night,
• Partly cloudy Monday, clouds increasing to mostly cloudy with a (30%) chance of rain Monday night,
• Then mostly cloudy with a (40%) chance of rain Tuesday.
• highs 42-45 lows 26-30. (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 mph. You should bundle up that’s pretty chilly.

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Forecast for Roseburg:

• Cloudy with rain and snow showers likely (60%) this evening, a good (50%) chance of rain and snow showers and colder late tonight (under 0.10 in. of rain possible, 1 in. of snow possible, snow level 1,500 ft.),
• Mostly cloudy Wednesday AM, just mostly sunny in the afternoon, mostly clear and colder late Wednesday night,
• Sunny Thursday (Thanksgiving Day) and Friday, clear Thursday night, mostly clear Friday night.
• lows 34-24 warming to 27 Friday night highs 40-43.
• Mostly sunny Saturday and Sunday, mostly clear Saturday night, partly cloudy Sunday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Monday (40%) chance of rain at night,
• Then mostly cloudy and a bit warmer with rain likely (70%) Tuesday.
• highs 42-49 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 cloudy with a (40%) chance of showers tonight (under 0.10 in. of rain possible),
• Partly cloudy Wednesday AM, sunny in the afternoon, clear at night,
• Sunny and a bit warmer Thursday (Thanksgiving Day) and Friday, clear Thursday night and Friday night.
• lows 36-29 warming to 34 Friday night highs 46-49
• Sunny Friday and Saturday, clear each night,
• Mostly sunny Sunday, partly cloudy Sunday night,
• Then mostly cloudy with a slight (20%) chance of rain Monday.
• highs 50-53 lows 36-44. (seasonal averages high 53 low 41).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with occasional light snow decreasing late tonight (2 in. of snow possible),
• Mostly cloudy with occasional snow flurries Wednesday AM, partly cloudy in the afternoon, mostly clear and very cold at night,
• Sunny Thursday (Thanksgiving Day) and Friday, clear Thursday night, mostly clear Friday night.
• snow level sat the surface tonight and Wednesday, then free air freezing level at the surface Wednesday night through Friday night.
• lows 15-10 warming to 12 Friday night highs 24-30.
• Mostly sunny Saturday and Sunday, mostly clear Saturday night, partly cloudy Sunday night,
• Partly cloudy Monday, more clouds to mostly cloudy with a (30%) chance of rain at night,
• Then mostly cloudy with a (40%) chance of rain Tuesday.
• free air freezing level at the surface Saturday, 3,500 ft. Saturday night, at the surface Sunday, 4,500 ft. Sunday night, 5,500 ft. Monday and Monday night, then 6,000 ft. Tuesday.
• highs 28-37 lows 16-22.

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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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