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. The next cold front is pushing in to the Pacific Northwest tonight and early Saturday.

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Advisories:  A WINTER WEATHER ADVISORY IS IN EFFECT FROM 1 AM UNTIL 9 PM SATURDAY FOR  THE NORTH OREGON CASCADES NOT INCLUDING THE CASCADES OF LANE COUNTY. A FREEZE WATCH IS IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING 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 rain developing and increasing late tonight (0.50 in. of rain possible), occasional showers Saturday 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, a slight (20%) chance of showers late Saturday night (0.10 in. of rain possible), partly cloudy Sunday, mostly cloudy Sunday night, 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 lows 42-32 rising to 43 Tuesday night and 35 Wednesday night highs 50-58 cooling to 53 by Wednesday. 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: Mostly cloudy with a (30%) chance of evening rain, snow very late tonight (snow level 2,000 ft.), rain and snow showers Saturday AM, rain and snow showers likely (60%) in the afternoon (snow level 2,000 ft. rising to 2,500 ft. in the afternoon, (1 in. of snow possible), a (30%) chance of rain and snow showers Saturday night (snow level 2,000 ft. lowering to 1,000 ft.),  just mostly cloudy Sunday, a (30%) chance of rain late Sunday night, rain likely (60%) Monday through Tuesday, then cloudy with a good (50%) chance of showers Tuesday night lows 44-35 rising to 45 Monday night and near 40 Tuesday night highs 48-59 falling to 53 Tuesday. 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 rain tonight( snow level 2,000 ft. late), showers Saturday AM, a good (50%) chance of coastal afternoon showers, afternoon showers likely (60%) inland Saturday 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.) Saturday night, 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 lows 44-37 rising to 44 Tuesday night highs 50-55. 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 a (40%) chance of evening rain, rain and snow late tonight (2-4 in. of snow possible), snow showers Saturday (3-6 in. of snow possible), evening snow showers, scattered snow showers late Saturday night (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 Monday night snow level 6,500 ft. falling to 4,000 ft. late tonight, at the surface Saturday and Saturday night, 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 lows 26-20 rising to 32 Monday night highs 27-45. 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 40-38 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.