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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 (Sunday position shown) and another will follow close behind. Not much of a chance of a “White Christmas” in the valleys because it will be too warm. Our best chance of valley snows usually comes in January and February.
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Advisories: NONE AT THIS TIME.
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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: Cloudy with a slight (20%) chance of AM rain, a (30%) chance of rain this afternoon (0.10 in. of rain possible), cloudy with a good (50%) chance of rain tonight (Christmas Eve), rain likely (60%) Saturday (Christmas Day) (0.10 in. of rain possible), rain Saturday night (0.25 in. of rain possible), rain Sunday, and showers Sunday night highs near 48 lows 37-42. Mostly cloudy with showers likely (60%) Monday, then rain Monday night 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 a (40%) chance of rain today and breezy (wind: SE 15-25 mph gusts to 40 mph), rain likely (60%) tonight (Christmas Eve) and breezy (wind: SE 15-25 mph gusts to 40 mph in the evening), rain likely (60%) Saturday (Christmas Day), rain Saturday night, rain and showers Sunday AM, rain Sunday afternoon, rain and snow Sunday night highs 50-46 lows 42-37. Mostly cloudy with rain likely (60%) Monday through Tuesday, and rain Tuesday night, mostly cloudy with rain Wednesday, rain and snow showers likely (60%) Wednesday night and Thursday highs 45-48 lows 38-42. (seasonal averages high 48 low 34)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with a good (50%) chance of rain today and windy (wind: S 25-40 mph at the shore and S 20-30 mph inland), rain likely (60%) and windy (wind: S 25-35 mph gusts to 55 mph, then SE 15-25 mph late tonight) tonight (Christmas Eve), coastal rain and rain likely (60%) inland Saturday (Christmas Day) and breezy (wind: S 15-25 mph gusts to 40 mph late AM & early afternoon), rain Saturday night with a slight (20%) chance of thunderstorms late, showers likely (60%) Sunday with a slight (20%) chance of AM thunderstorms, rain and breezy Sunday night, rain Monday and Monday night highs 56-47 lows 46-42. Mostly cloudy with rain Tuesday through Wednesday, then showers likely (60%) Wednesday night and Thursday highs 47-52 lows 45-39. (seasonal averages high 52 lows 39).
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Forecast for the Cascades of Lane County: Cloudy with a slight (20%) chance of AM snow, a good (50%) chance of rain and snow this afternoon, cloudy with a (40%) chance of rain and snow tonight (Christmas Eve), cloudy with a (40%) chance of rain Saturday (Christmas Day) (0.10 in. of rain possible), rain and snow Saturday night (1-3 in. of snow possible), mostly cloudy with rain and snow Sunday (1-3 in. of snow possible), then snow showers Sunday night snow level 4,500 ft. today, rising to 5,500 ft tonight, 4,500 ft. Saturday and Saturday night, then 3,000 ft. Sunday and Sunday night highs 37-30 lows 28-22. Mostly cloudy with snow showers likely (60%) Monday, snow Monday night, snow and rain Tuesday through Wednesday, snow showers Wednesday night, and snow showers likely (60%) Thursday snow level 3,000 ft. Monday through Tuesday, 3,500 ft. Tuesday night, and 3,000 ft. Wednesday highs 30-33 lows 22-25.
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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.