Here is my new 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 9 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 26 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 16 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 FROM NOON FRIDAY UNTIL MIDNIGHT FRIDAY NIGHT ABOVE 4,000 FT. FOR THE NORTHERN OREGON CASCADES, NOT INCLUDING THE CASCADES OIN LANE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT UNTIL 7 PM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WIND ADVISORY IS IN EFFECT FROM 4 AM UNTL 4 PM FRIDAY NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
• A WIND ADVISORY IS IN EFFECT UNTIL 7 PM TONIGHT FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A FLOOD WATCH IS IN EFFECT THROUGH LATE FRIDAY NIGHT FOR THE CURRY COUNTY COAST, EASTERN CURRY COUNTY, JOSEPHINE COUNTY AND JACKSON COUNTY.

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

• Partly cloudy with isolated showers this evening, a good (50%) chance of rain late tonight (0.25 in. of rain possible),
• Mostly cloudy with rain and cooler Friday (0.50 in. of rain possible),  showers likely (70%) Friday night (0.10 in. of rain possible), and Saturday AM, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler in the afternoon, a good (50%) chance of showers Saturday night,
• Mostly cloudy with a good (50%) chance of AM showers, 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
• lows 44-33 highs 49-43.
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Monday, a (40%) chance of showers 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 a slight (20%) chance of evening showers, rain late tonight and Friday (snow level 3,000 ft. in the afternoon), showers and colder late Friday night (snow level 3,o00 ft.),
• Mostly cloudy and a bit cooler with rain and snow showers likely (70%) Saturday (snow level 2,500 ft), a (40%) chance of rain and snow showers late Saturday night (snow level 2,000 ft. falling to 1,500 ft. late at night),
• 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.
• lows 46-33 highs 52-44.
• Mostly cloudy with a (40%) chance of rain and snow showers Monday, cloudy with a good (50%) chance of rain and snow showers Monday night,
• A (40%) chance of rain and snow showers 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 and a slight (20%) chance of evening showers, rain and cooler late tonight and Friday, coastal showers with a slight chance of thunderstorms in the evening while showers inland Friday night,
• Mostly cloudy and a bit cooler Saturday with showers likely (70%) and isolated afternoon coastal thunderstorms while inland showers likely (70%) and a bit cooler Saturday afternoon, evening coastal showers likely (70%) and a good (50%) chance of showers late at night while a (50%) chance of inland showers Saturday night (snow level 2,000 ft),
• Mostly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms Sunday AM, then showers likely (70%) in the afternoon and Sunday night.
• lows 48-40 highs 53-48.
• Mostly cloudy with a (40%) chance of showers Monday, showers likely (70%) at 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 a (40%) chance of showers Thursday.
• highs 49-54 lows 42-46. (seasonal averages high 52 low 40).

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Forecast for the Cascades in Lane County:

• Cloudy with scattered rain and snow showers this evening, a good (50%) chance of rain and snow late tonight (0.25 in. of rain possible),
• Cloudy with rain and snow and colder Friday (1.00 in. of rain possible, 5-9 in. of snow possible), rain and snow showers and colder at night (1.00 in. of rain possible, 1-4 in. of snow possible),
• Mostly cloudy and a bit cooler with snow showers Saturday, 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 4,500 ft. tonight, 5,000 ft. Friday, 3,000 ft. Friday night, 2,500 ft. Saturday, then at the surface Saturday night through Sunday night.
• lows 32-17 highs 39-27.
• Mostly cloudy with a good (50%) chance of snow showers Monday, cloudy with a (40%) chance of snow showers Monday night and Tuesday (a bit warmer), mostly cloudy with a good (50%) chance of snow showers Tuesday night and Wednesday (a bit warmer), cloudy with a good (50%) chance of rain and snow Wednesday night,
• Then cloudy with a good (50%) chance of rain and snow Thursday.
• snow level at the surface Sunday through 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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