Here is my weekly weather quiz question. What is an “Inversion? Here is the correct answer. Inversion(abbrev. INVRN) Is generally, a departure from the usual increase or decrease in an atmospheric property with altitude. Specifically it almost always refers to a temperature inversion, i.e., an increase in temperature with height, or to the layer within which such an increase occurs. An inversion is present in the lower part of a cap.

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An Upper Level Low Pressure Trough (“U “shape) is slowly moving southward over the Pacific Northwest. The graphics for days 1-3 show a the frontal activity approaching Oregon.  The graphics for days 3-7 show more complex frontal activity moving our way Wednesday through next Sunday giving us chances of getting wet.

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Air Quality Index:

Eugene/Springfield: The Air Quality Index is 85 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 60 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 58 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

NOTE: Outdoor burning remains temporarily prohibited for the following areas: Eugene-Springfield (Always), Florence (Always), Lowell, Oakridge and UGB, and Springfield and UGB.

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ADVISORIES:

• A WINTER STORM WARNING IS IN EFFECT UNTIL 1 PM TODAY FOR THE NORTHERN OREGON CASCADE FOOTHILLS.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 6 PM TONIGHT FOR THE NORTHERN OREGON CASCADES.
• A WINTER WEATHER ADVISORY IS IN EFFECT IS IN EFFECT UNTIL 7 PM TONIGHT FOR THE CASCADES IN LANE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL NOON TODAY FOR THE COAST RANGE OF NORTHWESTERN OREGON.

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

• Mostly cloudy with AM rain, showers and a bit cooler this afternoon (0.25 in. of rain possible), showers tonight (0.25 in. of rain possible, under 1 in. of snow possible, snow level 1,00o ft.),
• Mostly cloudy with showers and a bit cooler Monday (0.10 in. of rain possible, snow level 1,000 ft.), rain at night (0.25 in. of rain possible, snow level 1,000 ft.),
• Mostly cloudy with AM rain, showers and a bit cooler Tuesday afternoon, then a good (50%) chance of showers Tuesday night (snow level 1,000 ft.).
• highs 44-42 lows 33-24.
• A mix of clouds and sun and a bit warmer with a (30%) chance of showers Wednesday, mostly cloudy with showers likely (70%) Wednesday night (snow level 1,000 ft.),
• Mostly cloudy with showers Thursday and at night (snow level 1,000 ft.),
• Then mostly cloudy with showers Friday, showers likely (70%) Friday night and Saturday.
• highs near 44 lows 29-32 cooling back to 39 Friday night (seasonal averages high 54 low 36)

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Home Wood Heating Advisory:

Posted Daily

Eugene-Springfield: GREEN– Burning is Allowed.

Oakridge: GREEN– Burning is Allowed.

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

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Forecast for the Umpqua Valley including Roseburg:

• Mostly cloudy with AM rain and snow and a slight (20%) chance of thunderstorms, and a bit cooler today (0.25 in. of rain possible snow level 1,500 ft.), a good (50%) chance of evening rain and snow, snow showers late tonight (0.25 in. of rain possible, snow level 600 ft.
• Mostly cloudy with showers, snow showers with a slight (20%) chance of thunderstorms Monday afternoon (0.25 in. of rain possible), evening rain and snow showers and a slight (20%) chance of thunderstorms, snow showers and a slight (20%) chance thunderstorms at night (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler with showers and snow showers and a slight (20%) chance of thunderstorms rain and snow showers Tuesday, then a good (50%) chance of snow showers Tuesday night,
• highs 45-42 lows 32-29.
• Mostly cloudy with a slight (20%) chance of AM snow showers, partly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Wednesday afternoon, a slight (20%) chance of evening rain and snow showers, mostly cloudy with a slight (20%) chance of rain and snow showers late Wednesday night,
• Mostly cloudy with rain and snow showers Thursday, a good (50%) chance of rain and snow showers late Thursday night,
• Mostly cloudy with rain and snow showers likely (70%) and a bit cooler Friday, then rain and snow showers Friday night and Saturday.
• highs 46-44 lows 29-33 cooling to 30 Friday night. (seasonal averages high 56 low 38)

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

• Mostly cloudy with AM coastal rain and a slight (20%) chance of thunderstorms with coastal showers likely (70%) and a slight (20%) chance of coastal thunderstorms and a bit cooler this afternoon while inland AM rain and snow with a slight (20%) chance of thunderstorms and inland showers with snow likely (70%) and a bit cooler this afternoon (0.25 in. of rain possible, 1 in. of snow possible, snow possibly heavy at times, snow level 1,500 ft. ), evening coastal showers likely (70%) with a slight (20%) chance of coastal thunderstorms and coastal showers a slight (20%) chance of thunderstorms late tonight while inland evening rain and snow likely (70%) with a slight (20%) chance of thunderstorms and inland showers and snow showers with a slight (20%) chance of inland thunderstorms late tonight (0.50 in. of rain possible, 2-4 in. of snow possible, snow level 900 ft., snow possibly heavy at times late tonight) and breezy (Wind: S 15-25 mph),
• Mostly cloudy with coastal showers and a (30%) chance of thunderstorms while showers and snow showers with a (30%) chance of thunderstorms and a bit cooler Monday (0.50 in. of rain possible, snow possibly heavy at times, snow level 1,000 ft. rising to 1,500 ft. in the afternoon), evening coastal with a (30%) chance of thunderstorms and coastal showers, snow showers and a slight (20%) chance of thunderstorms late at night while inland showers and snow showers with a slight (20%) chance of thunderstorms at night (0.50 in. of rain possible),
• Mostly cloudy with showers and snow showers and a slight (20%) chance of thunderstorms and a bit cooler Tuesday, evening rain and snow showers, then a good (50%) chance of rain and snow showers late Tuesday night.
• highs near 48 lows near 37-30.
• Mostly cloudy with a (30%) chance of AM rain and snow showers, partly cloudy with a slight (20%) chance of rain and snow showers and a bit warmer Wednesday afternoon, mostly cloudy with a (30%) chance of rain and snow showers Wednesday night,
• Mostly cloudy with showers Thursday, evening showers likely (70%), a good (50%) chance of rain and snow showers late at night,
• Mostly cloudy with a good (50%) chance of AM rain and snow showers, rain and snow showers and a bit cooler with rain and snow showers Friday afternoon, rain and snow showers Friday night,
• Then partly cloudy with rain and snow showers Saturday.
• highs 49-47  lows 29-34. (seasonal averages high 54 low 41)

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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:

• Mostly cloudy with AM snow, snow showers and cooler today (2-6 in. of snow possible), showers tonight (3-6 in. of snow possible),
• Mostly cloudy and a bit warmer with showers Monday (3-5 in. of snow possible), snow, possibly heavy at times, at night (6-10 in. of snow possible) and breezy (Wind: S 5-15 mph increasing and shifting to W 15-25 mph late at night),
• Mostly cloudy with AM rain or snow, showers and a bit cooler Tuesday afternoon (3-6 in. of snow possible), then a slight (20%) chance of snow showers Tuesday night.
• snow level at the surface tonight and Sunday, 1,500 ft. Sunday night, 2,000 ft. Monday,at the surface Monday night, 1,500 ft.  Tuesday, then at the surface Tuesday night.
• highs 43-26 lows 17-13.
• A mix of clouds and sun and a bit warmer with a (40%) chance of snow showers Wednesday, snow likely (70%) late Wednesday night,
• Mostly cloudy and a bit warmer with snow showers Thursday and at night,
• Mostly cloudy and a bit cooler with snow showers Friday, then snow showers likely (70%) Friday night and Saturday.
• snow level at the surface Wednesday through Saturday.
• highs 26-32 cooling to 27 Friday lows 13-20.

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For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com

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