Here is my new weekly weather quiz question. What is an “Algorithm?” Please remember to post your answer at the bottom of this page. An email will not suffice. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An upper level low pressure trough (Shaded “U” shape area with blue arrows) is sending more storms our way.  The graphic for days 3-7 shows the next series of fronts that we will see approaching Oregon Friday, Saturday, Sunday and again next Tuesday. It looks like there will be snow on the Cascade Passes for Thanksgiving through the weekend, BUT Willamette Pass and Hoodoo ski areas will not be open. I’d say they need two good snow storms to produce the approximately 30 inches of snow they need to open. Drive carefully! If you need to travel the passes remember this is the first real snow of the season and you will have to be prepared to chain-up if necessary.

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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 6 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

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

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Home Wood Heating Advisory:

Eugene-Springfield: Green – Burning is allowed.

Oakridge: Yellow – 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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Advisories:

• A HIGH WIND WARNING IS IN EFFECT FROM 1 AM UNTIL 10 AM THURSDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH WIND WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH THURSDAY EVENING FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM THURSDAY UNTIL 4 AM FRIDAY FOR THE NORTHERN OREGON CASCADES.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM THURSDAY UNTIL 10 PM FRIDAY FOR THE SOUTH CENTRAL OREGON CASCADES.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM THURSDAY UNTIL 10 AM FRIDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM THURSDAY UNTIL 10 PM FRIDAY ABOVE 4,500 FT. FOR THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A HIGH WIND WARNING IS IN EFFECT FROM 1 AM THURSDAY THROUGH 1 AM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WIND ADVISORY IS IN EFFECT FROM 1 PM THURSDAY UNTIL 10 AM SATURDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY.
• A FLOOD WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH LATE THURSDAY NIGHT FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY,
• A Permanent Health Advisory remains for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.
• A Blue-Green Algae Health Advisory remains in effect for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the presence of high levels of blue-green algae and associated toxins that can be harmful to people and animals. Swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing and power boating, should be avoided in areas where blooms are identified. Although toxins are not absorbed through the skin, contact with cells from a bloom can cause skin irritation and a red, puffy rash in individuals with skin sensitivities, or those who develop rashes easily.

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

• Cloudy with a slight (20%) chance of evening rain, a good (50%) chance of rain late tonight (0.50 in. of rain possible) and breezy (Wind: S 15-25 mph),
• AM rain likely (70%), cloudy and a bit warmer with a good (50%) chance of rain (1.00 in. of rain possible) Thursday afternoon (Thanksgiving Day) and breezy (Wind: S 15-25 mph gusts to 30 mph in the afternoon), rain Thursday night (0.50 in. of rain possible),
• AM rain, a good (50%) chance of rain and a bit cooler Friday afternoon (0.15 in. of rain possible), rain Friday night (0.15 in. of rain possible) and Saturday, then showers Saturday night.
• lows 45-40 highs 52-48.
• Mostly cloudy with rain and a bit cooler Saturday, showers at night,
• Mostly cloudy and a bit warmer with a (40%) chance of showers Sunday, rain likely (70%) Sunday night,
• Showers likely (70%) and a bit warmer Monday, a good (50%) chance of showers Monday night,
• Mostly cloudy with a slight (20%) chance of showers Tuesday, a (40%) chance of rain at night,
• Then mostly cloudy with a good (50%) chance of showers Wednesday.
• highs 49-52 cooling to 50 Wednesday lows 42-40. (seasonal averages high 50 low 36)
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Your College Football Forecast:

The Civil War Game:

Ducks vs Beavers at Reser Stadium, Corvallis – Kickoff: 1:00 PM PST – Mostly cloudy with rain 44 warming to 48 by the end of the game. That means a chilly and wet afternoon. Dress appropriately.

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Forecast for Roseburg:

• Cloudy with a (30%) chance of rain tonight (under 0.10 in. of rain possible, snow level 3,500 ft.),
• Cloudy and a bit warmer with a (30%) chance of rain (0.15 in. of rain possible, AM snow level 3,500 ft.) Thursday (Thanksgiving Day) and breezy (Wind: S 15-25 mph), a good (50%) chance of evening rain, rain possibly heavy at times late Thursday night,
• Mostly cloudy with rain and a it cooler Friday (0.50 in. of rain possible) through Saturday (0.50 in. of rain possible), then rain and snow showers late Saturday night.
• lows 43-38 highs 56-48.
• Cloudy with a (40%) chance of AM rain and snow showers, a good (50%) chance of showers Sunday afternoon, rain likely (70%) at night and Monday (a bit warmer), mostly cloudy with a (30%) chance of showers at night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Tuesday, a (30%) chance of rain Tuesday night,
• Then mostly cloudy with a good (50%) chance of showers and a bit cooler Wednesday.
• highs 48-54 Monday cooling to 50 Wednesday  lows 42-40 warming back to 42 Tuesday night. (seasonal averages high 51 low 39)

 

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

• Cloudy with a (40%) chance of evening coastal rain and coastal rain likely (70%) late tonight while a (40%) chance of inland rain tonight (0.50 in. of rain possible) and windy (Wind: S 25-35 mph at the shore while S 10-20 mph inland)
• Mostly cloudy with coastal rain while inland AM rain and rain likely (70%) inland Thursday afternoon (1.00 in. of rain possible) and windy (Wind: S 25-40 at the shore while S 15-25 mph inland- gusts 50-55 mph), rain (possibly heavy at times) and very windy (Wind: S 30-45 mph decreasing to S 15-20 mph late at night at the shore while S 15-25 mph inland decreasing to S 10-15 mph late at night) Thursday night (1.50 in. of rain possible),
• Mostly cloudy and a bit cooler with rain Friday (0.50 in. of rain possible) through Saturday (0.50 in. of rain possible), then showers Saturday night.
• lows 47-42 highs 58-52.
• Cloudy with a good (50%) chance of showers and a bit warmer Sunday, rain likely (70%) Sunday night,
• Rain and a bit warmer Monday, mostly cloudy with a slight (20%) chance of showers at night,
• Just mostly cloudy and a bit cooler Tuesday, mostly cloudy with a (40%) chance of rain Tuesday night,
• Then mostly cloudy with a good (50%) chance of showers Wednesday.
• highs 53-56 cooling to 54 Wednesday lows 45-43 warming to 47 Tuesday night. (seasonal averages high 53 low 42)

 

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Forecast for the Cascades in Lane County:

• Cloudy with a slight (20%) chance of rain and snow this evening, a good (50%) chance of snow and rain tonight (0.10 in. of rain possible),
• Cloudy with a good (50%) chance of snow and rain and a bit cooler Thursday (Thanksgiving Day), a (40%) chance of evening rain and snow, snow and rain late Thursday night through Saturday, then snow showers Saturday night.
• snow level 3,000 ft. tonight, 3,000 ft. rising to 4,500 ft. Thursday afternoon, 4,000 ft. Thursday night, 4,500 ft. Friday, 5,000 ft. Friday night, 4,000 ft. Saturday, then 3,000 ft. Saturday night.
• lows 30-33 cooling back to 20 Saturday night highs 37-34.
• Mostly cloudy and a bit warmer Sunday with a good (50%) chance of snow showers, snow and rain likely (70%) Sunday night,
• Rain and snow showers and a bit warmer Monday, mostly cloudy with a good (50%) chance of rain and snow showers at night,
• A slight (20%) chance of rain and snow showers and a bit warmer Tuesday, a (40%) chance of rain and snow Tuesday night,
• Then mostly cloudy and a bit warmer with snow showers likely (70%) and a good (50%) chance of showers Wednesday.
• snow level 2,500 ft. Sunday, 2,500 ft. Sunday night, 3,500 ft. Monday through Tuesday, 5,000 ft. Tuesday night, then 4,000 ft. Wednesday.
• highs 33-38 lows near 25.

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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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