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Santa will need an umbrella. He’ll need to get up into the mountains to see some snow.
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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, still offshore, that will come in for Christmas Day 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 WIND ADVISORY IS IN EFFECT UNTIL 10 AM SATURDAY (CHRISTMAS DAY) FOR JACKSON COUNTY OF OREGON.
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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%) tonight (Christmas Eve)(0.10 in. of rain possible), rain likely (60%) Saturday (Christmas Day) (0.25 in. of rain possible), rain Saturday night (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 lows 37-40 highs near 48. 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 likely (60%) tonight (Christmas Eve), rain Saturday (Christmas Day), showers Saturday night 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, lows 40-36 highs 50-46. 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: Cloudy with rain tonight (Christmas Eve) and breezy (wind: S 15-25 mph decreasing to S 10-15 mph late tonight at the shore and S 10-20 mph shifting SE 5-10 mph late tonight inland) tonight (Christmas Eve), rain Saturday (Christmas Day), showers Saturday night 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 lows 46-42 highs 47-50. 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 a (30%) chance of rain and snow this evening, then a (40%) chance of rain late tonight (Christmas Eve), cloudy with AM rain and snow likely (60%), a good (50%) chance of rain and snow Saturday afternoon (Christmas Day) (1 in. of snow possible), rain and snow Saturday night (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 lows 27-20 highs 39-29. 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.