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Check out my latest Eugene Daily News Weather Or Not Column The Poem Is Beautiful, But Trees Can Make Us Work Hard.

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And don’t forget my latest feature story in the continuing series on service club organizations called “Assistance” Is Their First Name.

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Here is my weekly weather quiz question for the last time. What is a “ Lifted Index?”  Here is the correct answer. Lifted Index (abbrev. LI)- A common measure of atmospheric instability. Its value is obtained by computing the temperature that air near the ground would have if it were lifted to some higher level (around 18,000 feet, usually) and comparing that temperature to the actual temperature at that level. Negative values indicate instability – the more negative, the more unstable the air is, and the stronger the updrafts are likely to be with any developing thunderstorms. However there are no “magic numbers” or threshold LI values below which severe weather becomes imminent. I’ll have a new weekly weather question for you starting Monday. 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 pressure trough  (Shaded “U” shape with blue arrows) continues to move through the Pacific Northwest. A strong frontal system pushes through bringing even more rain.  Another frontal system will push toward Oregon next Friday returning another chance of rain.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 16 in the Good category measuring Particulate Matter at Amazon Park, Eugene. Data courtesy of Lane Regional Air Protection Agency (LRAPA) Oakridge:

The Air Quality Index is 32 in the Good category measuring Particulate Matter at Willamette Activity Center, Oakridge. Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Home Wood Heating Advisory:

Eugene/Springfield: GREEN – burning is allowed.

Oakridge:  GREEN – burning is allowed.

(The use of Pellet stoves is always allowed.)

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR THE NORTHERN OREGON CASCADES AND THE CASCADES OF LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOUS MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
• A FREEZE WARNING IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 9 AM TUESDAY FOR THE SOUTH CENTRAL OREGON COAST.
• A FROST ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 9 AM TUESDAY FOR THE SOUTH CENTRAL OREGON COAST.
• A HEALTH ADVISORY CONTINUES FOR THE PRESENCE OF BLUE-GREEN ALGAE IN WILLOW CREEK RESERVOIR IN MORROW COUNTY, 40 MILES SW OF BEND, FOR TENMILE LAKES IN COOS COUNTY, AND AT DEVILS LAKE IN LINCOLN COUNTY. THE TOXIC ALGAE BLOOM MEANS THAT PEOPLE SHOULD NOT DRINK OR HAVE DIRECT CONTACT WITH THE AFFECTED WATER AND THAT ALSO GOES FOR ANY PETS.

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

• Mostly cloudy with a good (50%) chance of scattered showers and a slight (20%) chance of thunderstorms this evening, a good (50%) chance of showers late tonight (0.10 in. of rain possible, more in storms),
• Cloudy with patchy fog and a slight (20%) chance of AM showers, a good (50%) chance of showers Sunday afternoon and evening (0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers late Sunday night (under 0.10 in. of rain possible),
• Patchy AM fog, mostly cloudy with a slight (20%) chance of rain Monday (under 0.10 in. of rain possible), a good (50%) chance of rain at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (40%) chance of rain Tuesday AM, a slight (20%) chance of showers in the afternoon, then just mostly cloudy Tuesday night.
• lows 39-43 highs 53-58.
• Mostly cloudy Wednesday, mostly cloudy with a good (50%) chance of rain Wednesday night,
• A (30%) chance of rain Thursday (Thanksgiving Day), a (40%) chance of rain at night and Friday, then cloudy with a good (50%) chance of rain Friday night and Saturday.
• highs 55-50 lows near 42. (seasonal averages high 50 low 37).

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Forecast for the Umpqua Basin including Roseburg:

• Cloudy with a showers and a slight (20%) chance of thunderstorms this evening, a good (50%) chance of showers late tonight (under 0.10 in. of rain possible),
• Cloudy with patchy AM fog, just cloudy Sunday, mostly cloudy with a slight (20%) chance of evening showers,  patchy fog late Sunday night,
• Mostly cloudy with AM fog, cloudy with a (30%) chance of rain Monday (under 0.10 in. of rain possible) and at night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with a (30%) chance of rain Tuesday, then just mostly cloudy Tuesday night.
• lows 42-39 warming to 44 Tuesday night highs 50-53.
•  Mostly cloudy with patchy fog Wednesday, mostly cloudy with a slight (20%) chance of rain and patchy fog late Wednesday night,
• Mostly cloudy with patchy fog and a slight (20%) chance of rain Thursday (Thanksgiving Day) and Thursday night,
• Mostly cloudy with a (40%) chance of rain Friday, then cloudy with a good (50%) chance of rain Friday night and Saturday.
• highs 53-55 cooling to near 50 Saturday lows 45-42. (seasonal averages high 51 low 40)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Mostly cloudy with showers and a slight (20%) chance of thunderstorms this evening, a (40%) chance of  showers late tonight (under 0.10 in. of rain possible),
• Cloudy with patchy AM fog, a slight (20%) chance of coastal showers Sunday afternoon and evening (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of evening coastal showers, mostly with patchy fog at night (under 0.10 in. of rain possible),
• Patchy AM fog, cloudy with a (40%) chance of rain Monday, mostly cloudy with a good (50%) chance of rain at night and patchy fog late,
• Mostly cloudy with patchy AM fog, a (40%) chance of rain Tuesday afternoon, then just mostly cloudy at night.
• lows 45-48 highs 54-58.
• Mostly cloudy with patchy fog Wednesday, a good (50%) chance of rain with patchy fog Wednesday night,
• Patchy fog with a (40%) chance of rain Thursday (Thanksgiving Day) and Thursday night,
• Mostly cloudy with a good (50%) chance of rain Friday, then rain likely (70%) Friday night and Saturday.
• highs 57-54 lows 50-48 warming back to 50 Friday night. (seasonal averages high 54 low 42)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers this evening, colder with a good (50%) chance of rain and snow showers late tonight (0.25 in. of rain possible, 3.00 in. of snow possible).
• Cloudy with a good (50%) chance of rain and snow showers Sunday afternoon and in the evening (0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of rain and snow showers late Sunday night,
• Mostly cloudy with a slight (20%) chance of rain and snow Monday afternoon, rain likely (60%)  Monday night,
• A good (50%) chance of rain Tuesday AM, a slight (20%) chance of afternoon showers, then mostly cloudy with a slight (20%) chance of rain Tuesday night.
• snow level 4,000 ft. tonight and Sunday, 4,500 ft. Sunday night, 5,500 ft. Monday, above 8,000 ft. Monday night through Tuesday night.
• lows 27-35 highs 35-47.
• Mostly cloudy Wednesday, mostly cloudy with a slight (20%) of rain at night,
• A mix of clouds and sun with a slight (20%) chance of rain Thursday (Thanksgiving Day), mostly cloudy with a slight (20%) chance of rain Thursday night,
• Mostly cloudy with a (40%) chance of rain Friday, then a good (50%) chance of rain at night and Saturday.
• free air freezing level 10,000 ft. Wednesday, snow level 8,000 ft. Wednesday night, 7,500 ft. Thursday, 7,000 ft. Thursday night, 7,500 ft. Friday, 7,000 ft. Friday night, then 6,500 ft. Saturday.
• highs 46-40 lows 34-32.

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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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