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 then the cold front behind it falls apart. There will be a bit of a break Wednesday while another frontal system will approach the Oregon coast Friday bringing back the chance of rain.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

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

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Advisories:

• A HIGH SURF ADVISORY IS IN EFFECT FROM 10 PM WEDNESDAY UNTIL 7 PM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A HIGH WIND WATCH IS IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY AFTERNOON FOR 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 patchy fog late tonight,
• Patchy AM fog, cloudy Wednesday, a slight (20%) chance of evening rain, rain late Wednesday night (0.25 in. of rain possible),
• Rain and cooler Thursday, heavy at times in the AM, and breezy (Wind: S 15-25 mph shifting to SW 10-15 mph in the afternoon), evening showers, rain late Thursday night and Friday AM, showers and a bit cooler in the afternoon, then showers likely (70%) Friday night.
• lows 47-53 cooling back to near 40 Friday night highs 57-52.
• Mostly cloudy and a bit cooler with showers likely (70%) Saturday, cloudy with a good (50%) chance of showers Saturday night,
• Mostly cloudy with a slight (20%) chance of showers and cooler Sunday, a (30%) chance of showers at night,
• A mix of clouds and sun with a (30%) chance of rain and snow showers Monday, a (30%) chance of showers Monday night,
• Then mostly cloudy with a (30%) chance of showers Tuesday.
• highs 45-40 warming back to 45 Tuesday lows 35-38. (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:

• Cloudy with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with areas of fog and a slight (20%) chance of showers Wednesday AM, just mostly cloudy in the afternoon, becoming cloudy with a (30%) chance of rain Wednesday night (under 0.10 in. of rain possible).
• Mostly cloudy with rain and a bit cooler Thursday through Friday, evening showers likely (70%), then a good (50%) chance of showers and colder late Friday night.
• lows 46-52 cooling to 39 Friday night highs 60-50.
• Cloudy with a (40%) chance of rain and snow showers Saturday through Monday night,
• Then cloudy and a bit cooler with a (40%) chance of rain and snow Tuesday.
• highs 47-45 warming to 48 Tuesday lows 34-36. (seasonal averages high 51 low 37)

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

• Cloudy with a slight (20%) chance of showers late tonight,
• Mostly cloudy with areas of fog and a slight (50%) chance showers Wednesday AM, just mostly cloudy in the afternoon, cloudy with a good (50%) chance of evening rain and rain late at night while a slight (20%) chance of evening inland rain and rain likely (70%) late at night inland (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler with rain Thursday and breezy (Wind: S 15-25 mph shifting SW 10-15 mph in the afternoon), rain Thursday night and Friday, evening showers, then showers likely (70%) Friday night.
• lows 50-54 cooling to 44 Friday night highs 62-54.
• Cloudy and a bit cooler with a good (50%) chance of AM showers, showers likely (70%) and a bit cooler Saturday afternoon, mostly cloudy with a (40%) chance of showers and a bit cooler Saturday night,
• Mostly cloudy with a (30%) chance of rain and snow showers Sunday, partly cloudy with a slight (20%) chance of showers at night,
• A (40%) chance of showers Monday and Monday night,
• Then cloudy with a (40%) chance of rain Tuesday.
• highs 49-52 lows 49-52. (seasonal averages high 52 low 40).

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Forecast for the Cascades in Lane County:

• Mostly cloudy tonight,
• Cloudy Wednesday, a slight (20%) chance of evening rain, rain likely (70%) late at night (0.25 in. of rain possible),
• Cloudy with rain and a bit cooler Thursday and breezy (Wind:S 15-25 mph shifting to SW 10-15 mph in the afternoon), evening rain and snow showers, rain at night,
• Mostly cloudy with AM rain, rain and snow and cooler Friday afternoon, then rain and snow showers Friday night.
• free air freezing level 9,000 ft. tonight and Wednesday, 7,000 ft. rising to above 8,000 ft. Wednesday night, above 8,000 ft. falling to 6,500 ft. Thursday afternoon, 5,500 ft. rising to 7,000 ft. late Thursday night, 6,000 ft. falling to 4,000 ft. Friday afternoon, then 3,500 ft. Friday night.
• lows 34-37 cooling to near 23 Friday night highs 43-38.
• Mostly cloudy and a bit cooler with snow showers likely (70%) Saturday, a good (50%) chance of snow showers Saturday night,
• A mix of clouds and sun with a slight (20%) chance of snow showers Sunday, mostly cloudy with a slight (20%) chance of snow showers Sunday night,
• A mix of clouds and sun with a good (50%) chance of snow showers Monday, mostly cloudy with a (40%) chance of snow showers Monday night,
• Then cloudy with a good (50%) chance of snow showers Tuesday.
• snow level 2,500 ft. Saturday, then at the surface Saturday night through Tuesday.
• highs 29-26 warming to 32 Tuesday lows 18-16 warming to 19 Monday 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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