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 120 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Oakridge: The Air Quality Index is 149 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 52 in the Moderate 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:

• Sunny and cold with patchy freezing fog this AM, sunny this afternoon, 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 and cold with patchy freezing fog late Sunday night and Monday AM, then mostly cloudy and a bit warmer with a slight (20%) chance of rain or snow Monday afternoon, patchy fog late Monday night.
• highs 45-43 warming back to 45 Monday lows 22-35.
• Patchy AM fog, mostly cloudy Tuesday, rain likely (70%)  Tuesday night,
• Mostly cloudy and a bit warmer with a good (50%) chance of rain Wednesday night,
• Rain likely (60%) Thursday, a good (50%) chance of showers at night,
• Then mostly cloudy with a (30%) chance of showers Friday.
• highs 44-49 lows near 38. (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:

• Patchy fog through early afternoon, sunny this afternoon, 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 and a bit warmer with a slight (20%) chance of rain Monday AM, a slight (20%) chance of afternoon showers, then just mostly cloudy Monday night.
• highs 40-46 lows 25-35.
• Mostly cloudy and a bit warmer Tuesday, cloudy with a (40%) chance of rain Tuesday night through Wednesday night,
• Mostly cloudy with rain likely (60%) Thursday and at night,
• Then mostly cloudy and a bit cooler with a slight (20%) chance of showers Friday.
• highs 50-57 cooling to 49 Friday lows 42-40. (seasonal averages high 50 low 38)

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

• Sunny today and Sunday, clear tonight, mostly clear Sunday night,
• Mostly cloudy with a good (50%) chance of rain Monday AM, a slight (20%) chance of showers of afternoon showers, just mostly cloudy Monday night.
• highs near 53 lows 30-42.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Tuesday, cloudy with a good (50%) chance of rain in the evening, rain likely (70%) late Tuesday night,
• A good (50%) chance of rain Wednesday, rain likely (70%) Wednesday night,
• Rain Thursday, a good (50%) chance of rain at night,
• Then mostly cloudy with a slight (20%) chance of showers Friday.
• highs 55-60 cooling back to 55 Thursday and Friday lows 47-43. (seasonal averages high 52 low 41).

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Forecast for the Cascades in Lane County:

• Sunny today and Sunday, clear and cold tonight, mostly clear and cold Sunday night,
• Partly cloudy in the AM, then mostly cloudy with a slight (20%) chance of rain and snow Monday afternoon and evening, just mostly cloudy late Monday night.
• free air freezing level 6,000 ft. today, 7,000 ft. tonight, 6,500 ft. Sunday, 6,000 ft. Sunday night, then 3,500 ft. Monday and Monday night.
• highs near 36 lows 14-24.
• A mix of clouds and sun and a bit warmer Tuesday, becoming mostly cloudy with a  good (50%) chance of rain and snow Tuesday night through Wednesday night,
• Rain and snow likely (60%) and a bit cooler Thursday, mostly cloudy with a good (50%) chance of rain and snow showers Thursday night,
• Then mostly cloudy and a bit cooler with a (40%) chance of rain and snow showers Friday.
• free air freezing level 6,500 ft. Tuesday, snow level 5,000 ft. Tuesday night, 6,500 ft. Wednesday, 6,000 ft. Wednesday night and Thursday, 4,000 ft. Thursday night, then 3,500 ft. Friday.
• highs 39-34 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.