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. Look at the graphic for days 1-3 shows the frontal system that moves in Tuesday. The graphic for days 3-7 shows the next series of fronts that we will see approaching Oregon every other day- Tuesday, Thursday and Saturday with more to follow.

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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 31 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 26 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 WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 PM TUESDAY UNTIL 10 AM WEDNESDAY ABOVE 4,500 FT. FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 3 PM TUESDAY UNTIL 1 AM WEDNESDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
• A Permanent Health Advisory is still in effect 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:

• Partly cloudy this evening, mostly cloudy with patchy fog late tonight,
• Cloudy with areas of AM fog and a slight (20%) chance of rain, rain and a bit cooler Tuesday afternoon (0.25 in. of rain possible) and evening, showers late at night (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler with showers likely (70%) Wednesday (0.25 in. of rain possible), rain likely (70%) Wednesday night (0.25 in. of rain possible),
• Mostly cloudy with rain, heavy at times in the AM, Thursday (Thanksgiving Day) then rain at night.
• lows 37-42 highs 52-50.
• Mostly cloudy with rain Friday, rain likely (70%) Friday night,
• Rain and a bit warmer Saturday and at night,
• Mostly cloudy with rain likely (70%) Sunday, rain Sunday night,
• Then mostly cloudy with showers Monday.
• highs 48-50 lows near 42. (seasonal averages high 50 low 37)
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Your College Football Forecast:

Saturday November 26th- The Civil War Game:

Ducks vs Beavers at Reser Stadium, Corvallis – Kickoff: 1:00 PM PST – Too soon for an accurate weather forecast, but as of now it looks like a very rainy day with temperatures from 44 warming to 48 by the end of the game.

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Forecast for Roseburg:

• Mostly cloudy with isolated evening showers, areas of fog late tonight,
• A slight (20%) chance of showers with areas of fog Tuesday AM, showers and a bit cooler in the afternoon (0.25 in. of rain possible) and evening, showers with a slight (20%) chance of thunderstorms late Tuesday night (0.25 in. of rain possible),
• Mostly cloudy with AM rain and snow showers likely (70%) and a slight (20%) chance of thunderstorms (gusty winds and small hail possible), showers likely (70%) and a bit cooler Wednesday afternoon (0.10 in. of rain possible, snow level 3,000 ft. rising to 3,500 ft. in the afternoon), evening rain likely (70%), rain late Wednesday night (under 0.10 in. of rain possible),
• Then mostly cloudy and a bit cooler with rain Thursday (Thanksgiving Day) and Thursday night.
• lows 42-44 highs 54-48.
• Mostly cloudy with rain and a bit warmer Friday, rain and snow likely (70%) in the evening, rain likely late (70%) Friday night,
• Cloudy with AM rain and snow, rain and a bit warmer with rain Saturday afternoon and at night,
• Then mostly cloudy with rain likely (70%) and a bit warmer Sunday and Monday, rain Sunday night.
• highs 50-47 warming to 54 Monday lows 42-45 cooling back to 42 Sunday night. (seasonal averages high 51 low 39)

 

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

• Mostly cloudy with a slight (20%) chance of coastal rain late tonight while inland patchy fog late tonight,
• Mostly cloudy with AM fog and coastal rain likely (70%), showers Tuesday afternoon (0.25 in. of rain possible), showers with a slight (20%) chance of thunderstorms at night, gusty winds and small hail possible late Tuesday night (0.25 in. of rain possible),
• AM showers with a slight (20%) chance of thunderstorms (gusty winds and small hail possible), showers a bit cooler Wednesday afternoon (0.25 in. of rain possible), coastal rain Wednesday night while evening inland rain likely (70%) and inland rain late at night (0.25 in. of rain possible), windy (Wind: SW 10-20 mph increasing to S 20-30 mph gusts to 45 mph late at night),
• Mostly cloudy with rain (possibly heavy at times) and breezy Thursday (Thanksgiving Day) and Thursday night.
• lows 46-48 highs near 55.
• Mostly cloudy and a bit cooler with rain and breezy Friday, rain Friday night through Saturday night,
• Mostly cloudy with rain likely (70%) and a bit warmer Sunday, then rain Sunday night and Monday.
• highs 53-55 lows 46-48. (seasonal averages high 54 low 42)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of evening rain and snow showers,  just partly cloudy late tonight,
• A mix of clouds and sun and a bit cooler with a good (50%) chance of rain and snow Tuesday afternoon, evening rain and snow, rain and snow showers late at night (0.50 in. of rain possible, 1-4 in. of rain possible),
• Mostly cloudy and bit cooler with snow showers likely (70%) and showers Wednesday, snow and rain likely (70%) Wednesday night and breezy (Wind: SW 10-15 mph increasing and shifting to S 15-25 mph gusts to 40 mph late Wednesday night),
• Then mostly cloudy with snow and rain and a bit cooler Thursday (Thanksgiving Day) and Thursday night.
• snow level 4,000 ft. tonight, 5,000 ft. Tuesday afternoon, 4,500 ft. falling to 3,500 ft. late Tuesday night, 3,000 ft. Wednesday and Wednesday night, then 4,000 ft. Thursday and Thursday night.
• lows near 28 highs 42-34.
• Mostly cloudy with rain and snow Friday, snow and rain likely (70%) Friday night,
• Snow and rain and a bit cooler Saturday and at night,
• Snow with rain likely (70%) and a bit warmer Sunday, snow and rain Sunday night,
• Then  mostly cloudy with rain and snow showers Monday.
• snow level 4,500 ft. Friday, 3,000 ft. Friday night through Sunday, 4,000 ft. Sunday night, then 3,500 ft. Monday.
• highs 35-32 warming to 34 Sunday lows 25-27.

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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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