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) slides in bringing some rain for your Tuesday. There will be a bit of a break Wednesday while another frontal system will approach the Oregon coast Thursday bringing back the chance of rain.

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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 96 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 35 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:

• Mostly cloudy with morning rain, a good (50%) chance of rain this afternoon (under 0.10 in. of rain possible), mostly cloudy with patchy fog and a slight (20%) chance of showers late tonight,
• Patchy AM fog, mostly cloudy Wednesday afternoon, a slight (20%) chance of evening, rain late Wednesday night (0.15 in. of rain possible), Thursday and Thursday night.
• highs 58-53 lows 45-49 cooling back to 45 Thursday night.
• Mostly cloudy and a bit cooler with rain 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 52-44 warming to 46 Monday 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:

• Patchy AM fog, mostly cloudy with a (30%) chance of showers this afternoon (under 0.10 in. of rain possible), cloudy with a slight (20%) chance of showers late tonight (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 slight (20%) chance of evening rain, rain late Wednesday night (under 0.10 in. of rain possible).
• Then mostly cloudy with rain and a bit cooler Thursday and Thursday night.
• highs 56-60 cooling to 54 Thursday lows 44-48 cooling to 44 Thursday night.
• Mostly cloudy with rain and cooler Friday, mostly 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 cloudy and 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:

• Patchy AM fog, cloudy with a (40%) chance of showers today, cloudy with a slight (20%) chance of coastal showers late tonight,
• Mostly cloudy with areas of AM fog, a slight (20%) chance of coastal rain Wednesday 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) and breezy (Wind: S 15-25 mph at the shore while S 10-15 mph inland),
• Then mostly cloudy and a bit cooler with rain Thursday and breezy, rain Thursday night.
• highs 58-60 cooling to 57 Thursday night lows 50-53 cooling to 49 Thursday night.
• Cloudy with rain and a bit cooler Friday, mostly cloudy with showers likely (70%) Friday night and  Saturday, then mostly cloudy with a (40%) chance of showers and a bit cooler Saturday night through Sunday night,
• Then a good (50%) 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:

• Mostly cloudy and a bit warmer with morning rain, a good (50%) chance of rain this afternoon, a slight (20%) chance of evening rain, a (40%) chance of showers late tonight,
• A slight (20%) chance of AM showers,  mostly cloudy and a bit warmer Wednesday afternoon, then becoming cloudy with a (40%) chance of rain late at night,
• Rain Thursday and at night.
• snow level 7,500 ft. today through Wednesday night, 8,000 ft. falling to 7,000 ft. Thursday, then 6,500 ft. rising to 7,500 ft. Thursday night.
• highs 40-45 lows 33-36 cooling to near 34 Thursday night.
• Mostly cloudy with rain 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 6,500 ft. Friday, 3,500 ft. Friday night, 3,000 ft. Saturday, 2,500 ft. Saturday night, then at the surface Sunday through Monday.
• highs 38-27 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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