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The upper air flow (yellow jet stream and dark colors for winds) shows a  trough of low pressure swinging down from the Gulf of Alaska (“U” shape offshore) which will be pushing lots of moisture our way. A frontal system has moved through the Pacific Northwest (actually a dual system) spreading rain , wind, and higher elevation snow (those snow levels will be dropping). More storms will be coming at us next week and one will push through for Christmas Eve. Still not much of a chance of a “White Christmas” in the valleys. Our best chance of valley snows usually comes in January and February.

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Advisories:  A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM  MONDAY FOR THE SOUTH CENTRAL AND SOUTHERN CASCADES, THE SISKIYOU MOUNTAINS, AND ABOVE 4,000 FT. FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY, AND ABOVE 4,500 FT. FOR  CENTRAL AND EASTERN LAKE COUNTY.

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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: Mostly cloudy with showers and a slight (20%) chance of thunderstorms this evening (0.25 in. of rain possible), showers likely (60%) Sunday (0.25 in. of rain possible), rain Sunday night (0.25 in. of rain possible), rain Monday (0.10 in. of rain possible), and rain likely (60%) Monday night (0.10 in. of rain possible), mostly cloudy with rain likely (60%) Tuesday and Tuesday night lows 37-40 highs near 45. Mostly cloudy with rain Wednesday, rain likely (60%) Wednesday night, rain Thursday, rain likely (60%) Thursday night through Friday night (Christmas Eve), and rain Saturday (Christmas Day) highs near 46 lows 37-40. (seasonal averages highs 45 low 33)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with showers  this evening, rain and snow late tonight (snow level 2,500 ft. falling to 2,000 ft. late at night, no accumulation expected), AM rain Sunday with rain and snow showers and possible afternoon and evening thunderstorms (snow level 3,000 ft. falling to 1,500 ft., 1-2 in. of snow possible), rain and snow showers late Sunday night (1-2 in. of snow possible), rain and snow Monday AM, then rain Monday afternoon (snow level 2,000 ft. rising to 2,500 ft.), evening rain and snow showers, rain and snow Monday night,  AM rain and snow Tuesday, rain in the afternoon and evening, then rain and snow likely (60%) Tuesday night lows 36-40 highs 46-42. Mostly cloudy with AM rain and snow Wednesday, then rain Wednesday night through Thursday night, rain likely (60%) Friday and Friday night (Christmas Eve), and rain Friday (Christmas Day) highs 44-49 lows 37-40. (seasonal averages high 48 low 35)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with evening coastal showers and isolated thunderstorms, rain and isolated thunderstorms late at night, evening showers inland then rain late at night, coastal rain and isolated thunderstorms Sunday AM, AM rain inland, then showers and isolated thunderstorms Sunday afternoon and evening, showers and breezy Sunday night (wind: S 15-20 mph then S 20-30 mph late evening and night at the shore and S 10-20 mph gusts to 40 mph late evening and early AM inland), AM rain and isolated thunderstorms Monday, afternoon rain and breezy (wind: S 15-25 mph gusts to 40 mph in the afternoon), evening showers then rain late Monday night through Tuesday night lows 40-42 highs 46-50. Mostly cloudy with rain Wednesday through Friday (Christmas Day) highs 47-50 lows bouncing back and forth between 39-45. (seasonal averages high 53 lows 39).

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Forecast for the Cascades of Lane County: Mostly cloudy with rain and snow showers tonight (1-3 in. of snow possible), rain and snow showers likely (60%) Sunday (1-4 in. of snow possible), snow and rain Sunday night (3-5 in. of snow possible), snow and rain Monday (1-3 in. of snow possible), snow and rain likely (60%) Monday night (1 in. of snow possible), and mostly cloudy with snow and rain likely (60%) Tuesday and Tuesday night snow level 3,000 ft. tonight and Sunday, 2,500 ft. Sunday night and Monday, and 2,500 ft. Monday night, and 3,000 ft. Tuesday and Tuesday night lows near 25 highs 30-32. Mostly cloudy with snow Wednesday, snow and rain likely (60%) Wednesday night, snow and rain Thursday, then rain and snow likely (60%) Thursday night through Friday night (Christmas Eve), rain and snow Friday (Christmas Day) snow level 2,500 ft. Wednesday,  3,000 ft. Wednesday night, 3,500 ft. Thursday, 4,500 ft. Thursday night, 5,000 ft. Friday and Friday night, and 4,000 ft. Saturday highs 32-35 lows between 25-29.

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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.