Here is my weekly weather quiz question for the last time. What is “the chromosphere?” Here is the correct answer. The Chromosphere In solar-terrestrial terms, is the layer of the solar atmosphere above the photosphere and beneath the transition region and the corona. I’ll have a new weekly weather quiz question for you starting Monday. 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 blocking high pressure ridge (Shaded “Arch” shaped with blue arrows) has settled 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. A frontal system will be on its way to the Oregon coast Monday bringing back the slight chance of rain by Monday afternoon.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 46 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 21 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 35 in the Good category measuring Particulate Matter.

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

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Advisories:

• A FREEZE WARNING IS IN EFFECT FROM 10 PM TONIGHT UNTIL 9 AM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A FROST ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL 9 AM SUNDAY 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,
• A mix of clouds and sun with patchy AM freezing fog, sunny and a bit cooler Sunday afternoon, mostly clear in the evening, partly cloudy and cold with patchy freezing fog late Sunday night,
• Patchy AM freezing fog, mostly cloudy and a bit cooler Monday with a slight (20%) chance of rain or snow in  the afternoon, a slight (20%) chance of rain in the evening, patchy fog late Monday night and Tuesday AM, just mostly cloudy and a bit warmer in the afternoon, then rain likely (70%) Tuesday night.
• lows 20-39 highs 43-40 warming to 44 Tuesday.
• Mostly cloudy and a bit warmer with a good (50%) chance of rain Wednesday and Wednesday night,
• Rain Thursday, showers likely (70%) at night,
• Mostly cloudy with a (30%) chance of showers Friday, a slight (20%) chance of rain Friday night,
• Then mostly cloudy with a (40%) chance of rain Saturday.
• highs near 49 lows 39-37. (seasonal averages high 48 low 36)

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Your College Football Forecast:

The regular season is over now. Forecasts will be posted for Bowl Games when applicable.

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Forecast for Roseburg:

• Clear with areas of freezing fog late tonight and Sunday AM, sunny and a bit warmer Sunday afternoon, clear with patchy fog Sunday night,
• Mostly cloudy with patchy fog and a (30%) chance of rain Monday AM, a  (30%) chance of afternoon showers and a bit cooler, mostly cloudy in the evening, partly cloudy with patchy fog late Monday night,
• Mostly cloudy with patchy AM fog, just mostly cloudy and a bit warmer Tuesday afternoon, then mostly cloudy with rain likely (60%) Tuesday night.
• lows 27-42 highs 47-43 warming to 52 Tuesday.
• Mostly cloudy and warmer with a (40%) chance of rain Wednesday, cloudy with a (40%) chance of rain Wednesday night,
• Mostly cloudy with rain likely (60%) Thursday and at night,
• A bit cooler with a slight (20%) chance of showers Friday and Friday night,
• Then mostly cloudy with a slight (20%) chance of rain Saturday.
• highs 57-50 lows 43-40. (seasonal averages high 49 low 38)

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

• Clear tonight,
• Sunny Sunday, mostly clear in the evening, partly cloudy with a slight (20%) chance of coastal rain late Sunday night,
• Cloudy with AM coastal rain likely (70%) and a slight (20%) chance of rain Monday AM, a bit cooler with a slight (20%) chance of afternoon showers while a good (50%) chance of inland AM rain and afternoon inland showers, just mostly cloudy Monday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Tuesday afternoon, cloudy with a good (50%) chance of rain in the evening, then rain likely (70%) late Tuesday night.
• lows 30-47 highs 54-50 warming to 55 Tuesday.
• Rain likely (60%) and a bit warmer Wednesday and Wednesday night,
• Mostly cloudy and a bit cooler with rain and breezy Thursday, cloudy with a good (50%) chance of rain at night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Friday and Friday night,
• Then cloudy with a (30%) chance of rain Saturday.
• highs 59-53 lows 47-44. (seasonal averages high 52 low 41).

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Forecast for the Cascades in Lane County:

• Clear and cold tonight,
• Sunny Sunday, mostly clear and cold Sunday night,
• Partly cloudy in the AM, mostly cloudy with a slight (20%) chance of rain and snow Monday afternoon and evening, just mostly cloudy late Monday night,
• A mix of clouds and sun and a bit warmer Tuesday, then becoming mostly cloudy with a good (50%) chance of rain and snow Tuesday night.
• free air freezing level 7,000 ft. tonight, 6,500 ft. Sunday, 6,500 ft. falling to 6,000 ft. Sunday night, then 3,500 ft. Monday and Monday night, 6,500 ft. Tuesday, then 5,000 ft. Tuesday night.
• lows 15-33 highs 36-39.
• Mostly cloudy and a bit warmer with a  good (50%) chance of rain Wednesday, a (40%) chance of rain and snow Wednesday night,
• Rain and snow likely (60%) and a bit cooler Thursday, mostly cloudy with rain and snow showers likely (60%) Thursday night,
• Mostly cloudy and a bit cooler with a (40%) chance of rain and snow showers Friday, a slight (20%) chance of rain and snow showers at night,
• Then mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow Saturday.
• snow level 7,000 ft. Wednesday, 6,000 ft. Wednesday night, 5,500 ft. Thursday, 3,500 ft. Thursday night through Friday night, then 4,500 ft. Saturday.
• highs 42-34 warming to 36 Saturday lows 32-27.

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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.