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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 is pushing this frontal system in for today and more storm systems will follow close behind. No real chance of a “White Christmas” in the valleys because it will be too warm with rain. Our best chance of valley snows usually comes in January and February.
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Advisories: A WINTER STORM WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH LATE SUNDAY AFTERNOON ABOVE 2,000 FT. FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY. A WIND ADVISORY IS IN EFFECT UNTIL 1 PM TODAY FOR JACKSON 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 rain likely (60%) today (Christmas Day) (0.25 in. of rain possible), rain tonight (0.25 in. of rain possible) and Sunday (0.25 in. of rain possible), and showers Sunday night (0.25 in. of rain possible), showers likely (60%) Monday, and rain Monday night highs near 48 lows 37-40. Mostly cloudy with rain Tuesday through Wednesday, showers Wednesday night, and showers likely (60%) Thursday highs 48-42 lows near 37. (seasonal averages highs 45 low 33)
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Forecast for the Umpqua Basin including, Roseburg: Cloudy with rain today (Christmas Day), showers tonight and Sunday (snow level 3,500 ft.), showers likely (60%) Sunday night (snow level 2,500 ft.), rain likely (60%) Monday, showers likely (60%) Monday night highs 50-46 lows 40-36. Mostly cloudy with rain Tuesday through Wednesday, rain and snow showers Wednesday night, rain and snow showers likely (60%) Thursday and Thursday night, mostly cloudy with a good (50%) chance of showers Friday highs 50-42 lows 38-33. (seasonal averages high 48 low 34)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with rain today (Christmas Day), showers tonight and Sunday windy (wind: SW 20-30 mph at the shore and SW 15-25 mph inland), coastal showers with showers likely (60%) inland Sunday night and breezy (wind: SW 15-25 mph gusts to 45 mph in the evening), rain likely (60%) and breezy Monday, then showers Monday night highs 47-50 lows 46-42. Mostly cloudy with rain Tuesday through Wednesday, rain and snow showers Wednesday night, showers likely (60%) Thursday and Thursday night, then mostly cloudy with a good (50%) chance of showers Friday highs 52-46 lows 38-40. (seasonal averages high 52 lows 39).
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Forecast for the Cascades of Lane County: Cloudy with AM rain and snow likely (60%), a good (50%) chance of rain and snow this afternoon (Christmas Day) (1 in. of snow possible), rain and snow tonight (1-3 in. of snow possible), mostly cloudy with rain and snow Sunday (2-5 in. of snow possible) and breezy (wind: S 15-25 mph gusts to 40 mph), snow showers Sunday night (5-8 in. of snow possible) and breezy (wind: SW 15-25 mph gusts to 40 mph), snow showers likely (60%) Monday, and snow Monday snow level 8,000 ft tonight, falling to 4,500 ft. Saturday and Saturday night, then 3,000 ft. Sunday through Monday night highs 39-29 lows 27-20. Mostly cloudy with snow and rain Tuesday through Wednesday, snow showers Wednesday night, then snow showers likely (60%) Thursday through Friday snow level 3,000 ft. Monday through Tuesday, 3,500 ft. Tuesday night, and 3,000 ft. Wednesday highs 33-29 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.