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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The upper airflow (Follow the shaded area with blue arrows) will be sending more moisture our way. A warm front (Shown in red) will slide in bringing some showers tonight and rain for your Tuesday. There will be a bit of a break Wednesday while another frontal system will approach the Oregon Thursday bringing back the chance of rain.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 10 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 16 in the Good category measuring Particulate Matter.

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

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Advisories: None At This Time.

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

• Partly cloudy this evening, becoming mostly cloudy with a slight (20%) chance of showers late tonight,
• Cloudy and cooler with a good (50%) chance of rain Tuesday (under 0.10 in. of rain possible), mostly cloudy with patchy fog and a slight (20%) chance of rain late at night),
• Patchy AM fog, mostly cloudy and a bit warmer with a slight (20%) chance of rain Wednesday afternoon and evening, rain late Wednesday night (0.15 in. of rain possible) and Thursday, then showers Thursday night.
• lows 42-46 cooling to 44 Thursday night highs 52-56 cooling to 54 Thursday.
• Mostly cloudy and a bit cooler with showers likely (70%) Friday, a good (50%) chance of showers and a bit cooler Friday night and Saturday, a (40%) chance of showers Saturday night and Sunday, a good (50%) chance of showers Sunday night,
• Then cloudy with a (40%) chance of showers Monday.
• highs 50-47 lows 40-37. (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:

• Partly cloudy this evening, increasing clouds to mostly cloudy with patchy fog and a slight (20%) chance of rain late tonight,
• Patchy AM fog, mostly cloudy Tuesday with a (30%) chance of rain in the afternoon (under 0.10 in. of rain possible), a slight (20%) chance of rain at night (under 0.10 in. of rain possible),
• Mostly cloudy with areas of AM fog Wednesday, becoming partly cloudy and a bit warmer in the afternoon, a (30%) chance of showers Wednesday night (under 0.10 in. of rain possible).
• Then mostly cloudy with rain and a bit cooler Thursday and Thursday night.
• lows 42-48 cooling to 44 Thursday night highs 56-54.
• Showers likely (70%) and cooler Friday, cloudy with a good (50%) chance of showers at night,
• Mostly cloudy with showers likely (60%) and cooler Saturday, then mostly cloudy with a good (50%) chance of rain and snow showers Saturday night through through Sunday night,
• Then a bit cooler with a (30%) chance of showers Monday.
• highs 52-42 lows 40-35. (seasonal averages high 51 low 37)

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

• Mostly cloudy tonight with a (30%) chance of coastal rain while a slight (20%) chance of inland rain late tonight,
• Patchy AM fog, mostly cloudy with a (40%) chance of rain Tuesday, partly cloudy in the evening, increasing clouds to cloudy with a slight (20%) chance of coastal rain late Tuesday night,
• Mostly cloudy with areas of AM fog, a slight (20%) chance of coastal rain Wednesday afternoon otherwise mostly sunny in the afternoon, mostly cloudy with a good (50%) chance of evening rain, coastal rain late Wednesday night while inland rain likely (70%) late at night (0.15 in. of rain possible),
• Then mostly cloudy and a bit cooler with rain Thursday and Thursday night.
• lows 50-53 cooling to 49 Thursday night highs 58-54.
• Cloudy with showers likely (60%) and a bit cooler Friday through Saturday, then mostly cloudy with a good (50%) chance of showers and a bit cooler Saturday night through Sunday night,
  Then a (30%) chance of showers Monday.
• highs 53-47 lows 44-40. (seasonal averages high 52 low 40).

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Forecast for the Cascades in Lane County:

• Partly cloudy this evening, becoming mostly cloudy late tonight,
• Cloudy and a bit warmer with a good (50%) chance of rain Tuesday, a (40%) chance of rain Tuesday night,
• Just mostly cloudy and a bit warmer Wednesday, then becoming cloudy with a (40%) chance of rain late at night,
• Rain Thursday, then showers at night.
• free air freezing level 7,500 ft. tonight, snow level 7,500 ft. Tuesday and Tuesday night, free air freezing level 8,000 ft. rising to 9,000 ft. Wednesday afternoon, snow level 7,500 ft. Wednesday night, 8,000 ft. falling to 7,000 ft. Thursday, then 7,500 ft. rising to 8,000 ft. Thursday night.
• lows 26-35 cooling to near 30 Thursday night highs 43-45.
• Mostly cloudy with showers and a bit cooler Friday, rain and snow showers likely (70%) and cooler Friday night and Saturday, mostly cloudy with a (40%) chance of snow showers Saturday night and Sunday, then mostly cloudy with a good (50%) chance of snow showers Sunday night and Monday.
• snow level 6,000 ft. Friday, 3,500 ft. Friday night, 3,000 ft. Saturday, 2,500 ft. Saturday night, then at the surface Sunday through Monday.
• highs 38-30 lows 27-20 warming to 23 Sunday night.

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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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