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The upper airflow is bringing much colder air toward us both aloft and at the surface.  Another trough of low pressure will slide in along the coast sending more storms our way and dropping snow levels in the mountains. A complex frontal system is moving into Oregon from British Columbia through Washington bringing with it cold air that will drop snow levels well below the passes. An arctic air mass will be pushed South by a strong jet stream (see airflow graphic above) and will move down behind that cold front Sunday night through Tuesday giving us the possibility of some snowflakes even reaching the Valley floor.

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Advisories: A WINTER WEATHER ADVISORY IS IN EFFECT FROM 1 PM TODAY UNTIL 4 AM MONDAY ABOVE 1,500 FT. FOR THE CENTRAL COAST RANGE OF OREGON,  THE NORTH CASCADES FOOTHILLS AND THE FOOTHILLS OF LANE COUNTY, FOR THE NORTH CASCADES AND THE CASCADES OF LANE COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 1 PM TODAY UNTIL 4 AM MONDAY ABOVE 1,000 FT. FOR CENTRAL DOUGLAS COUNTY AND THE CURRY COUNTY COAST (ABOVE 1,000 FT.),

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Here are your detailed forecasts. **

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Partly cloudy with a (30%) chance of showers this AM, becoming mostly cloudy with showers likely (60%) in the afternoon (0.10 in. of rain possible), showers likely (60%) this evening, a good (50%) chance of showers tonight (0.25 in. of rain possible), mostly cloudy with showers mixed with snow at times in the afternoon Monday (little if any accumulation) (0.10 in. of rain possible), snow showers in the evening, a (40%) chance of snow showers Monday night (less than 1 in. of snow possible) highs 42-37 lows 33-26. Mostly sunny Tuesday, partly cloudy Tuesday night, a mix of clouds and sun Wednesday, partly cloudy Wednesday night, mostly cloudy Thursday (Thanksgiving Day), mostly cloudy at night with a slight (20%) chance of rain, then mostly cloudy with a slight (20%) chance of rain Friday and cloudy with a (30%) chance of rain Friday night and mostly cloudy Saturday with a (30%) chance of rain highs 38-46 lows 30-36. (seasonal averages highs 50 low 37)

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Forecast for the Umpqua Basin including, Roseburg: Cloudy  today with a good (50%) chance of AM rain and snow showers, then rain and snow showers likely (60%) in the afternoon (snow level 500 ft. rising to 2,000 ft. in the afternoon) (1-2 in. of snow possible), rain and snow showers tonight and Monday (snow level 1,500 ft. tonight falling to 1,000 ft. late at night), mostly cloudy with rain and snow showers likely (60%) Monday night (snow level 1,000 ft.)  highs 40-37 lows 34-27. Mostly cloudy with a slight (20%) chance of snow showers Tuesday AM, a slight (20%) chance of snow Tuesday night, patchy AM and late at night  fog Wednesday and Wednesday night,  patchy AM fog Thursday (Thanksgiving Day) then mostly cloudy, partly cloudy with areas of fog Thursday night, patchy AM fog Friday then mostly cloudy with a slight (20%) chance of showers Friday afternoon, then mostly cloudy with a slight (20%) chance of rain Friday night and Saturday highs 34-47 lows 27-37. (seasonal averages high 53 low 39)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy today with a good (50%) chance of AM coastal showers, then showers this afternoon, a good (50%) chance of AM rain and snow showers inland then rain and snow showers in the afternoon (snow level 2,000 ft. no accumulation expected), coastal showers tonight, evening showers then rain and snow showers late tonight inland (snow level 2,000 ft. no accumulation expected), coastal showers likely (60%) and rain and snow showers likely (60%) inland Monday and Monday night (snow level 1,500 ft. Monday and 1,000 ft. Monday night), breezy Monday night (wind: W 20-25 mph shifting NW 10-20 mph late at night ) highs 43-45 lows 35-33. Mostly cloudy with a (40%) chance of rain and snow showers Tuesday AM and a slight (20%) chance of rain and snow Tuesday night, patchy AM fog and mostly cloudy Wednesday and not as cool, partly cloudy with fog late Wednesday night, AM fog Thursday (Thanksgiving Day) then mostly cloudy, partly cloudy with areas of fog Thursday night, AM fog then mostly cloudy with a slight (20%) chance of showers Friday afternoon, mostly cloudy with a slight (20%) chance of rain Friday night, and a (30%) chance of rain Saturday highs 40-50 lows near 30-35. (seasonal averages high 56 lows 42).

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Forecast for the Cascades of Lane County:  Partly cloudy this AM, becoming mostly cloudy with snow showers likely (60%) in the afternoon (2 in. of snow possible), snow showers tonight (3-6 in. of snow possible) and Monday (4-6 in. of snow possible), mostly cloudy with snow showers likely (60%) and colder Monday night (3-6 in. of snow possible,  AM clouds with a slight (20%) chance of snow showers then a mix of clouds and sun Tuesday afternoon, partly cloudy Tuesday night snow level at the surface through Tuesday, free air freezing level at the surface Tuesday night highs 25-20 lows 20-9  warming to 15 Tuesday night. A mix of clouds and sun Wednesday partly cloudy Wednesday night, mostly cloudy Thursday (Thanksgiving Day), mostly cloudy  with a slight (20%) chance of rain or snow Thursday night through Saturday free air freezing level at the surface Wednesday and Wednesday night,  3,000 ft. Thursday, and snow level 3,000 ft. Thursday night, and a snow level 2,500 ft. Friday, 3,500 ft. Friday night, and 3,000 ft. Saturday highs 30-38 lows 20-26-23.

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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.