Here is my new weekly weather quiz question. What is “Alluvium?”  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 Days 1,2 & 3 graphic shows the frontal system that moved through the Pacific Northwest. The graphic for days 3-7 more frontal systems will march toward us on Saturday and late Sunday into Monday. There will be continued snow on the Cascade Passes but snow levels will continue to rise and fall. So far Willamette Pass and Hoodoo ski areas are not open. Mt. Ashland announced today that they are starting their ski season early- this Sunday December 4th. I’d say they need two good snow storms to produce the approximately 30 inches of snow needed at Willamette Pass and Hoodoo for them to open. Drive carefully! If you need to travel the passes remember 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 13 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 13 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: 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 FREEZE WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY MORNING FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY AND JACKSON 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:

• Mostly cloudy with a good (50%) chance of showers tonight (0.10 in. of rain possible) and Thursday AM, a slight (20%) chance of showers and a bit cooler in the afternoon,  a slight (20%) chance of rain at night with patchy fog late,
• Mostly cloudy with areas of AM fog and a slight (20%) chance of rain, a good (50%) chance of rain Friday afternoon (under 0.10 in. of rain possible), cloudy with a good (50%) chance of rain Friday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM rain, a (30%) chance of rain and a bit warmer Saturday afternoon, then cloudy with a good (50%) chance of rain Saturday night.
• lows 39-36 warming to 45 Friday cooling to 43 Saturday night highs 48-53.
• Rain and a bit cooler Sunday, evening showers likely (70%), rain and snow showers likely (70%) late Sunday night,
• Cloudy and much cooler with a good (50%) chance of rain and snow showers Monday, a (40%) chance of rain and snow showers at night,
• A a mix of clouds and sun and a bit cooler with a slight (20%) chance of snow showers Tuesday, then just mostly cloudy Tuesday night and Wednesday (a bit warmer).
• highs 48-40 warming to 42 Wednesday lows 37-29. (seasonal averages high 48 low 35)

 

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Forecast for Roseburg:

• Mostly cloudy with evening rain and snow showers likely (70%), a good (50%) chance of rain and showers late tonight (under 0.10 in. of rain possible, snow level 3,500 ft. falling to 3,000 ft.),
• Mostly cloudy with a slight (20%) chance of rain and snow showers and a bit cooler Thursday (snow level 2,500 ft. rising to 3,000 ft.), just mostly cloudy in the evening, mostly clear with patchy freezing fog late Thursday night,
• Partly cloudy with areas of AM fog, mostly cloudy with a slight (20%) chance of rain Friday afternoon, cloudy with a (40%) chance of rain at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of rain and a bit warmer Saturday and in the evening, then rain late Saturday night.
• lows 38-43 highs 47-55.
• Mostly cloudy with AM rain, rain and snow and a bit cooler Sunday afternoon, rain and snow showers and cooler at night and Monday, cloudy with a good (50%) chance of rain and snow showers at night,
• Mostly cloudy and a bit cooler with a (40%) chance of rain and snow showers Tuesday, then mostly cloudy with a slight (20%) chance of rain and snow Wednesday (a bit warmer).
• highs 50-42 lows 44-40 warming to 47 Tuesday night. (seasonal averages high 49 low 38)

 

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

• Mostly cloudy with a (40%) chance of showers tonight (under 0.10 in. of rain possible),
• A slight (20%) chance of  showers Thursday AM (under 0.10 in. of rain possible), mostly cloudy and a bit cooler in the afternoon and evening, just partly cloudy with patchy coastal fog late Thursday night,
• Areas of AM fog, mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday afternoon (under 0.10 in. of rain possible), cloudy with coastal rain likely (70%) while a good (50%) chance of inland rain Friday night (0.25 in. of rain possible),
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Saturday and in the evening, then rain late Saturday night.
• lows 42-39 warming to 43 Saturday night highs 52-56.
• Mostly cloudy with rain and a bit cooler Sunday, evening showers, then rain and snow showers late Sunday night,
• Rain and snow showers likely (70%) and a bit cooler Monday, cloudy with a (40%) chance of rain and snow showers Monday night and Tuesday (a bit cooler), mostly cloudy with a slight (20%) chance of rain and snow showers at night,
• Then mostly cloudy and a bit warmer with a (30%) chance of rain and snow Wednesday.
• highs 52-48 warming back to 52 Wednesday lows 40-38. (seasonal averages high 52 low 41)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening snow showers likely (70%), a good (50%) chance of snow showers late tonight (0.25 in of rain possible, 2 in. of snow possible),
• Mostly cloudy with a (40%) chance of snow showers and a bit warmer Thursday, mostly cloudy in the evening, just partly cloudy and colder late at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of AM rain and snow, a good (50%) chance of snow and rain and a bit warmer Friday afternoon, becoming cloudy with a good (50%) chance of evening snow, rain and snow likely (70%) late Friday night,
• Mostly cloudy with a good (50%) chance of rain Saturday AM, a good (50%) chance of rain and snow Saturday afternoon, a good (50%) chance of rain and snow at night.
• snow level 2,500 ft. tonight, at the surface Thursday, free air freezing level at the surface Thursday night, snow level 3,000 ft. rising to 3,500 ft. Friday afternoon, 6,000 ft. Friday night, 7,500 ft. falling to 4,000 ft. Saturday afternoon, then 4,000 ft. rising to 5,000 ft. late Saturday night.
• lows 24-20 warming to 33 Friday night cooling to 30 Saturday night highs 32-37.
• Mostly cloudy with rain and snow and a bit cooler Sunday, snow showers likely (70%) at night,
• Snow showers likely (70%) and cooler Monday, cloudy with a good (50%) chance of snow showers at night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of snow showers Tuesday, just mostly cloudy Tuesday night,
• Then mostly cloudy and a bit warmer with a slight (20%) chance of snow Wednesday.
• snow level 4,500 ft. Sunday, then at the surface Sunday night through Tuesday, free air freezing level at the surface Tuesday night, then snow level at the surface Wednesday.
• highs 34-24 warming to 30 Wednesday lows 22-14.

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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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