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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 toward the coast  as a frontal system starts to push into the Pacific Northwest and more frontal systems will follow close behind starting Tuesday.

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Advisories: A WINTER STORM WARNING IS IN EFFECT FROM 1 AM TO 4 PM SUNDAY AFTERNOON ABOVE 2,000 FT. FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 6 AM SUNDAY 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 WEATHER ADVISORY IS IN EFFECT FROM 4 AM TO 4 PM SUNDAY ABOVE 2,000 FT. FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND THE SOUTH CENTRAL OREGON CASCADES,

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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 this evening, occasional showers tonight (0.25 in. of rain possible), showers Sunday (0.50 in. of rain possible) and breezy (wind: S 15-25 mph), showers Sunday night (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 breezy (wind: S 15-30 mph), then rain Tuesday and Tuesday night lows 36-43 highs 44-47. Mostly cloudy with rain Wednesday, showers Wednesday night, showers likely (60%) Thursday, a good (50%) chance of showers Thursday night, showers likely (60%) Friday and Friday night, and a good (50%) chance of showers Saturday (New Years Day) highs 38-46 lows 36-34. (seasonal averages highs 45 low 32)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain tonight (snow level 3,000 ft. falling to 2,500 ft. late tonight),  rain and snow Sunday AM, rain and snow showers in the afternoon (snow level 2,500 ft. falling to 2,000 ft. in the afternoon, 1-2 in. of snow possible), showers Sunday night (snow level 2,500 ft.), rain likely (60%) Monday (snow level 3,000 ft.), then rain Monday night through Tuesday night lows 40-36 highs 45-52. Mostly cloudy with rain and snow 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 rain and snow showers Friday, rain likely (60%) Friday night, and a good (50%) chance of rain and snow showers Saturday (New Years Day) highs 45-42 and rising to 46 Saturday lows near 32. (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 coastal rain this evening and showers and isolated thunderstorms late tonight, rain inland, windy (wind: SW 10-15 mph at the shore increasing to SW 20-30 mph late tonight),  coastal AM showers and isolated thunderstorms Sunday, AM rain inland, then showers in the afternoon, windy (coastal winds: SW 25-35 mph decreasing to SW 20-25 mph in the afternoon and gusts to 45 mph in the morning), showers Sunday night and breezy (wind: SW 15-25 mph gusts to 45 mph in the evening), coastal rain and inland rain likely (60%) Monday, rain  Monday night and windy (wind: S 20-30 mph gusts to 45 mph), then rain Tuesday and Tuesday night lows 40-46 and back to 40 Tuesday night highs 47-53. Mostly cloudy with rain Wednesday, rain and snow showers Wednesday night, rain and snow showers likely (60%) Thursday, showers likely (60%) Thursday night, mostly cloudy with a good (50%) chance of showers Friday, rain likely (60%) Friday night, then showers likely (60%) Saturday (New Years Day) highs 45-49 lows 39-35. (seasonal averages high 52 lows 39).

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Forecast for the Cascades of Lane County: Cloudy with snow and rain increasing tonight (2-5 in. of snow possible),  snow showers Sunday night (4-9 in. of snow possible) and windy (wind: W 10-20 mph gusts to 45 mph in higher elevations),  snow showers Sunday night (3-6 in. of snow possible) and breezy (wind: SW 15-25 mph gusts to 40 mph), snow showers likely (60%) Monday AM, snow likely (60%) in the afternoon (2-4 in. of snow possible), rain and snow Monday night (12 in. of snow possible) and breezy (wind: SW 15-25 mph gusts to 40 mph in higher elevations), then snow and rain Tuesday and Tuesday night snow level falling to 3,000 ft. late tonight, 2,500 ft. Sunday AM through Monday, 4,000 ft. rising to 4,500 ft. late Monday night,  4,500 ft. Tuesday, and 3,500 ft. Tuesday night lows near 26 highs 27-36. Mostly cloudy with snow Wednesday, snow showers Wednesday night, snow showers likely (60%) Thursday, then mostly cloudy with a good (50%) chance of snow showers Friday, and snow showers likely (60%) Friday night and Saturday snow level 2,500 ft. Wednesday, then at the surface Wednesday night through Saturday highs 26-32 lows near 23.

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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.