Here is my weekly weather quiz question. What is a “Nocturnal Inversion?” 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 sending more moisture our way. A frontal system moved into the Pacific Northwest bringing another round of rain and yet another storm will move through for your Friday.  A frontal system approaches the coast next Tuesday for more precipitation.

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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 13 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 19 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 UNTIL 4 AM SATURDAY FOR THE NORTHERN OREGON CASCADES.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM SATURDAY FOR THE CASCADES IN LANE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT UNTIL 7 PM TODAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM THIS EVENING UNTIL 10 AM SATURDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS AND JACKSON COUNTY.
• A WIND ADVISORY IS IN EFFECT UNTIL 7 PM TODAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.

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

• Mostly cloudy with showers and cooler this afternoon (0.25 in. of rain possible),  showers with a slight (20%) chance of evening thunderstorms (small hail possible), showers likely (70%) and colder late tonight (0.10 in. of rain possible, more in storms),
• Mostly cloudy with showers likely (70%) and a slight (20%) chance of thunderstorms and a bit cooler in the afternoon, a good (50%) chance of showers Saturday night and Sunday AM, a good (50%) chance of showers with a slight (20%) chance of thunderstorms and cooler Sunday afternoon, then a good (50%) chance of showers Sunday night.
• highs 52-43 lows 38-33.
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Monday and at night,
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Tuesday and Tuesday night,
• Cloudy with a good (50%) chance of showers and a bit warmer Wednesday, then cloudy with a (40%) chance of rain Wednesday night and Thursday.
• highs 45-49 lows 35-42. (seasonal averages high 49 low 35)

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Home Wood Heating Advisory:

Eugene-Springfield: GREEN – Burning is allowed.

Oakridge: GREEN – Burning is allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

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Forecast for Roseburg:

• Mostly cloudy with rain and snow showers this afternoon (1 in. of snow possible, snow level 2,500 ft.) in the afternoon), rain and snow showers and colder with a slight (20%) chance of thunderstorms late tonight (1-2 in. of snow possible, snow level 2,o00 ft.),
• Mostly cloudy and a bit cooler with rain and snow showers and a slight (20%) chance of thunderstorms Saturday (1-2 in. of snow possible, snow level 1,500 ft), a (40%) chance of rain and snow showers and a slight (20%) chance of thunderstorms in the evening, a slight (20%) chance of thunderstorms and snow showers late Saturday night (evening snow level 2,500 ft.),
• Mostly cloudy with a (40%) chance of rain and snow showers and a slight (20%) chance of thunderstorms in the AM, then rain and snow showers likely (70%) and a bit cooler Sunday afternoon and Sunday night.
• highs 52-44 lows 38-32.
• Mostly cloudy with a (30%) chance of rain and snow showers Monday, cloudy with a good (50%) chance of rain and snow showers Monday night and Tuesday, a (40%) chance of showers Tuesday night,
• Then cloudy with a (40%) chance of showers Wednesday through Thursday.
• highs 46-50 lows 32-42. (seasonal averages high 51 low 37)

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy with a good (50%) chance of showers early this afternoon, showers late this afternoon and cooler (snow level 2,000 ft.), coastal showers with a slight chance of thunderstorms tonight while showers and a slight (20%) chance of thunderstorms this evening inland and showers, snow showers and a slight (20%) chance of thunderstorms inland late tonight,
• Mostly cloudy and a bit cooler Saturday with showers and a slight (20%) chance of coastal thunderstorms in the afternoon while inland snow showers and a slight (20%)  chance of thunderstorms and a bit cooler in the afternoon (snow level 1,500 ft.), a good (50%) chance of evening showers with a slight (20%) chance of thunderstorms, coastal showers with a slight (20%) chance of thunderstorms late at night while a slight (20%) chance of inland snow showers and thunderstorms late Saturday night (snow level 1,500 ft),
• Mostly cloudy with a (40%) chance of coastal showers and a slight (20%) chance of thunderstorms Sunday while a slight (20%) chance of AM inland thunderstorms and snow showers and a (30%) chance of showers and snow showers and a slight (20%) chance of thunderstorms in the afternoon, mostly cloudy with a slight (20%) chance of evening showers, a (40%) chance of rain and snow showers late Sunday night.
• highs 53-48 lows 44-40.
• Mostly cloudy with a (40%) chance of rain and snow showers Monday AM, a good (50%) chance of showers in the afternoon, showers likely (60%) Monday night,
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Tuesday and Tuesday night,
• Cloudy and a bit warmer with a good (50%) chance of rain Wednesday and Wednesday night,
• Then mostly cloudy with rain likely (70%) Thursday.
• highs 49-54 lows 42-46. (seasonal averages high 52 low 40).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers and colder today (0.50 in. of rain possible, 3-6 in. of snow possible), rain and snow showers this evening, snow showers and colder tonight (0.50 in. of rain possible, 3-6 in. of snow possible),
• Mostly cloudy and a bit cooler with snow showers Saturday (2-4 in. of snow possible), snow showers likely (70%) in the evening, a good (50%) chance of snow showers late Saturday night,
• Then a good (50%) chance of snow showers and a bit cooler Sunday and Sunday night.
• snow level 4,000 ft. today, 2,500 ft. tonight, then at the surface Saturday through Sunday night.
• highs 39-27 lows 24-17.
• Mostly cloudy with a good (50%) chance of snow showers Monday, cloudy with a good (50%) chance of snow showers Monday night,
• A (40%) chance of snow showers and a bit warmer Tuesday , mostly cloudy with a good (50%) chance of snow showers Tuesday night and Wednesday (a bit warmer), then cloudy with a good (50%) chance of rain and snow Wednesday night and Thursday.
• snow level at the surface Monday, 2,500 ft. Monday night, at the surface Tuesday, 3,000 ft. Tuesday night and Wednesday, 5,000 ft. Wednesday night, then 4,500 ft. Thursday.
• highs 26-36 lows 19-26.

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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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