The jet stream shows a high pressure ridge (“arch” shape) moving away from us as a low pressure trough (“U” shape) dropping in behind it. A cold front pushed through the Pacific Northwest returning the chances for rain and seriously dropping the temperatures. There was a short break today, but the valley rain and mountain snow will return for next week as a frontal system hits us Monday.

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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, JOSEPHINE COUNTY, AND 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 a good (50%) chance of scattered showers and a slight (20%) chance of evening thunderstorms with possible small hail, partly cloudy with isolated showers late tonight (0.10 in. of rain possible, more in thunderstorms) and cooler, partly cloudy Sunday, mostly cloudy Sunday night with a slight (20%) chance of rain late, cloudy with rain likely (60%) Monday (0.25 in. of rain possible), rain likely (60%) Monday night (0.75 in. of rain possible), showers likely (60%) Tuesday, and a good (50%) chance of showers Tuesday night lows 33-44 cooling to 37 Tuesday night highs near 55. Mostly cloudy with a good (50%) chance of rain Wednesday, and Wednesday night, partly cloudy with a (30%) chance of showers Thursday, mostly cloudy with a (30%) chance of showers Thursday night, partly cloudy with a (30%) chance of showers Friday, then mostly cloudy with a (30%) chance of showers Friday night and Saturday highs near 55 lows 35-40. (seasonal  averages high 59 low 38)

Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with 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 with a (40%) chance of rain late Sunday night, rain likely (60%) Monday, rain Monday night, rain likely (60%) Tuesday, then cloudy with a good (50%) chance of rain and snow Tuesday night lows 35-45 cooling to near 40 Tuesday night highs 48-59 falling to 53 Tuesday. Mostly cloudy with showers likely (60%) Wednesday and Wednesday night, then mostly cloudy with a (30%) chance of showers Thursday through Saturday highs moving between 54 and 60 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 a slight (20%) chance of evening showers, then partly cloudy late tonight (evening snow level 1,500 ft.), partly cloudy Sunday AM, mostly cloudy in the afternoon, mostly cloudy Sunday night with a (40%) chance of rain late, coastal rain Monday with rain likely (60%) inland,  rain Monday night, rain likely (60%) Tuesday, then cloudy with a (40%) chance of rain Tuesday night, lows 36-45 cooling to 42 Tuesday night highs near 55. Mostly cloudy with showers likely (60%) Wednesday and Wednesday night, then mostly cloudy with a (40%) chance of showers Thursday through Friday, then a (30%) chance of showers Friday night and Saturday highs near 56-50 and back near 55 Friday and Saturday lows near 40. (seasonal averages high 56 low 42).

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Forecast for the Cascades of Lane County: Mostly cloudy with scattered showers this evening, a good (50%) chance of isolated snow showers late tonight and colder, partly cloudy with a slight (20%) chance of snow showers Sunday, mostly cloudy Sunday night, rain and snow likely (60%) Monday, rain and snow Monday night (3-7 in. of snow possible), rain and snow showers likely (60%) Tuesday, a good (50%) chance of snow showers Tuesday night snow level 3,000 ft. 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, 3,000 ft. Tuesday, and 2,500 ft. Tuesday night lows 18-34 cooling to 26 Tuesday night highs 40-45 falling to near 40 Tuesday. Mostly cloudy with rain and snow showers likely (60%) Wednesday, a good (50%) chance of rain and snow showers Wednesday night through Saturday snow level 4,000 ft. Wednesday, 3,000 ft. Wednesday night, 3,000 ft. Thursday,  3,500 ft. Thursday night through Saturday highs 40-32 lows 25-32.

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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.