The jet stream shows a high pressure ridge (“arch” shape) moving away from us as a low pressure trough (“U” shape) swings along shore and into Oregon. A cold front is pushing through the Pacific Northwest returning the chances for rain and seriously dropping the temperatures. There will be a short break Sunday, but the valley rain and mountain snow will return for next week.

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Advisories:  A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 9 PM THIS EVENING FOR  THE NORTH OREGON CASCADES NOT INCLUDING THE CASCADES OF LANE COUNTY. A FREEZE WARNING IS IN EFFECT FROM 3 AM UNTIL 9 AM SUNDAY FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, JACKSON COUNTY.

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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 occasional showers today with a slight (20%) chance of afternoon and evening thunderstorms with possible small hail (0.25 in. of rain possible, more in thunderstorms) and cooler,  partly cloudy with a slight (20%) chance of showers late tonight (0.10 in. of rain possible), partly cloudy Sunday, mostly cloudy Sunday night with a slight (20%) chance of rain late, cloudy with a good (50%) chance of rain Monday, rain likely (60%) Monday night and Tuesday, and a good (50%) chance of showers Tuesday night, a good (50%) chance of rain Wednesday, a (40%) chance of showers Wednesday night highs 50-58 cooling to 53 by Wednesday lows 33-45 cooling to 35 by Wednesday night. Partly cloudy with a (30%) chance of showers Thursday and Friday, and mostly cloudy with a (30%) chance of showers Thursday night highs near 55 lows 35-40. (seasonal  averages high 58 low 38)

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Forecast for the Umpqua Basin including, Roseburg: Cloudy with rain and snow showers likely (60%) this AM, rain and snow showers likely (60%) in the afternoon (snow level 2,000 ft.), a slight (20%) chance of rain and snow showers this evening, partly cloudy tonight (snow level 2,000 ft. this evening),  partly cloudy Sunday AM, just mostly cloudy Sunday afternoon, mostly cloudy Sunday night, rain likely (60%) Monday through Tuesday, then cloudy with a good (50%) chance of showers Tuesday night highs 48-59 falling to 53 Tuesday lows 35-45 cooling to near 40 Tuesday night. Mostly cloudy with rain likely (60%) Wednesday, then a (40%) chance of showers Wednesday night and Thursday, then a (30%) chance of showers Thursday night and Friday highs near 57 lows near 38. (seasonal averages high 62 low 39)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with showers this AM, a good (50%) chance of coastal afternoon showers, afternoon showers likely (60%) inland this afternoon (snow level 2,000 ft.), a (30%) chance of coastal evening showers, a slight (20%) chance of evening showers inland then a slight (20%) chance of inland rain and snow showers late (evening snow level 2,000 ft.) tonight, mostly cloudy Sunday AM, partly cloudy in the afternoon, mostly cloudy Sunday night with a slight (20%) chance of rain late, cloudy with a good (500%) chance of rain Monday, and rain likely (60%) Monday night and Tuesday,  then cloudy with a (40%) chance of showers Tuesday night highs 50-55 lows 36-44. Mostly cloudy with rain likely (60%) Wednesday, then a (40%) chance of showers Wednesday night through Friday highs near 55 lows 43-39. (seasonal averages high 56 low 42).

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Forecast for the Cascades of Lane County: Mostly cloudy with snow showers today (3-6 in. of snow possible), evening snow showers, scattered snow showers late tonight (2 in. of snow possible) and colder, partly cloudy with a slight (20%) chance of snow showers Sunday, mostly cloudy Sunday night, rain and snow Monday and rain and snow likely (60%) Monday night snow level at the surface today and tonight, 2,500 ft. rising to 3,000 ft. Sunday, free air freezing level rising to 4,500 ft. Sunday night, snow level 5,000 ft. Monday and Monday night highs 27-45 lows 19-30. Mostly cloudy with snow and rain likely (60%) Tuesday, a good (50%) chance of rain and snow showers Tuesday night, snow and rain likely (60%) Wednesday, a good (50%) chance of rain and snow showers Wednesday night, partly cloudy with a (40%) chance of rain and snow showers Thursday and Friday and mostly cloudy with a (40%) chance of snow showers Thursday night snow level 3,500 ft. Tuesday and Tuesday night,  3,000 ft. Wednesday through Thursday, 2,500 ft. Thursday night, then 3,500 ft. Friday highs 40-43 lows 25-30.

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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.