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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 (Saturday position). 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: Mostly cloudy with patchy fog late tonight, mostly cloudy with a slight (20%) chance of AM rain, a (40%) chance of rain Friday afternoon (0.10 in. of rain possible), cloudy with a good (50%) chance of rain Friday night (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 lows 34-42 highs near 48. 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 tonight, cloudy with a (40%) chance of rain Friday, rain likely (60%) Friday night (Christmas Eve), rain likely (60%) Saturday (Christmas Day), rain Saturday night, showers likely (60%) Sunday, rain and snow showers Sunday likely (60%) Sunday night lows 42-37 highs 50-46. 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 and breezy tonight (winds: S 20-30 mph at the shore and SE 10-20 mph inland), cloudy with a good (50%) chance of rain Friday and breezy (wind: S 20-30 mph at the shore and SE 10-20 mph inland), rain likely (60%) and breezy (wind: SE 15-25 mph) Friday night (Christmas Eve), coastal rain and rain likely (60%) inland Saturday (Christmas Day), rain Saturday night, showers likely (60%) Sunday through Monday, and rain Monday night lows 46-42 highs 56-47. 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: Mostly cloudy with a slight (20%) chance of rain this evening, a slight (20%) chance of AM snow, a (30%) chance of rain and snow Friday afternoon, cloudy with a (40%) chance of rain and snow Friday night (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, then snow showers Sunday night snow level 4,500 ft. tonight and Friday, rising to 5,500 ft Friday night, 4,500 ft. Saturday and Saturday night, then 3,000 ft. Sunday and Sunday night lows 28-22 highs 37-30. 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.