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The upper air flow (yellow jet stream and dark colors for winds) shows a trough of low pressure a (“U” shape offshore) sliding Eastward into the coast as a frontal system pushed through the Pacific Northwest and another frontal system will follow close behind Monday night intoTuesday (position shown on Wednesday).
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Advisories: A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL TO 4 AM MONDAY FOR THE COAST RANGE OF NORTHWEST OREGON AND THE CENTRAL COAST RANGE OF WESTERN OREGON, THE NORTH OREGON CASCADE FOOTHILLS, AND THE FOOTHILLS OF LANE COUNTY THE NORTH OREGON CASCADES AND THE CASCADES OF LANE COUNTY, AND THE UPPER HOOD RIVER VALLEY. A WINTER STORM WATCH IS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY AFTERNOON FOR THE NORTH OREGON CASCADES AND THE CASCADES OF LANE COUNTY. A HIGH WIND WATCH IS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING FOR THE NORTH AND CENTRAL OREGON COAST.
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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 this evening, showers likely (60%) late tonight (0.25 in. of rain possible), showers likely (60%) Monday AM, rain likely (60%) in the afternoon (0.25 in. of rain possible), rain Monday night (1.0 in of rain possible) and Tuesday (1.0 in of rain possible) and Tuesday night (0.50 in. of rain possible), showers possibly mixed with snow Wednesday, then showers likely (60%) Wednesday night lows 35-45 and back to 32 Wednesday night highs 48-38. Mostly cloudy with a chance of rain and snow showers Thursday, a good (50%) chance of showers Thursday night, partly cloudy with a (30%) chance of showers Friday, a slight (20%) chance of showers Friday night (snow level 1,000 ft.), then mostly cloudy with a slight (20%) chance of showers Saturday (New Years Day) through Sunday (snow level 1,000 ft. Saturday night) highs near 40 lows near 32. (seasonal averages highs 45 low 32)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with rain and snow showers tonight (snow level 2,000 ft. 1 in. of snow possible), showers likely (60%) Monday (snow level 3,500 ft.), rain Monday night through Tuesday night (snow level 2,500 ft.), rain and snow showers Wednesday, then rain and snow showers likely (60%) Wednesday night lows 35-44-36-32 highs 49-53-42. Mostly cloudy with rain and snow showers likely (60%) Thursday, a (%) chance of rain and snow showers Thursday night, mostly cloudy with a good (50%) chance of rain and snow Friday, a (40%) chance of rain and snow Friday night and Saturday (New Years Day), then mostly cloudy with a (40%) chance of rain and snow showers Saturday night and Sunday highs 40-45 lows near 26-34. (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 showers tonight and breezy (wind: SW 15-25 mph decreasing to SW 10-15 mph late at night), showers likely (60%) Monday and windy (wind: S 20-30 mph gusts to 45 mph), rain Monday night and windy (wind: SW 20-30 mph gusts to 45 mph), then rain Tuesday and breezy (wind: S 15-25 mph), rain Tuesday and breezy (wind: S 15-25 mph), rain Tuesday night, rain and snow showers Wednesday and breezy, then rain and snow showers likely (60%) Wednesday night lows 42-32 highs 54-44. Mostly cloudy with rain and snow showers likely (60%) Thursday, a (60%) chance of rain and snow showers Thursday night, mostly cloudy with a good (50%) chance of rain Friday and Friday night, a (40%) chance of rain Saturday (New Years Day), then a (40%) chance of showers Saturday night and a good (50%) chance Sunday highs 44-49 lows 32-36. (seasonal averages high 52 lows 39).
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Forecast for the Cascades of Lane County: Cloudy with snow showers tonight (5-9 in. of snow possible) and breezy (wind: SW 15-25 mph gusts to 40 mph higher elevations), snow showers likely (60%) Monday AM, snow and rain likely (60%) in the afternoon (2-4 in. of snow possible), snow and rain Monday night (12 in. of snow possible) and breezy (wind: SW 15-25 mph gusts to 40 mph in higher elevations), then rain and snow Tuesday (8-14 in. of snow possible), then snow at times Tuesday night (8-14 in. of snow possible) snow level 2,500 ft. rising to 3,000 ft. Monday afternoon, 3,000 ft. rising to 4,000 ft. late Monday night, 5,000 ft. Tuesday, falling to between 1,000 ft. and and 2,500 ft. Tuesday night lows 22-33-23 highs near 33. Mostly cloudy with snow showers Wednesday, snow showers likely (60%) Wednesday night and Thursday, mostly cloudy with a good (50%) chance of snow showers Thursday night, partly cloudy with a slight (20%) chance of snow showers Friday and Friday night, mostly cloudy with a (30%) chance of snow showers Saturday (New Years Day) and Saturday night, then a (40%) chance of snow showers Sunday snow level at the surface Wednesday through Sunday highs 26-32 lows 18-24.
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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.