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 is 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 FREEZE WARNING IS IN EFFECT UNTIL 9 TODAY 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: A mix of clouds and sun today, becoming  cloudy tonight, cloudy with a good (50%) chance of AM rain, rain likely (60%) Monday afternoon (0.25 in. of rain possible), rain Monday night (0.75 in. of rain possible), showers likely (60%) Tuesday, and a good (50%) chance of showers Tuesday night highs 54-58-53 lows 36-44 cooling to 37 Tuesday night. Mostly cloudy with showers 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 37-40. (seasonal  averages high 59 low 38)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy today, cloudy tonight, a slight (20%) chance of AM rain, afternoon rain likely (60%) Monday, rain Monday night, rain likely (60%) Tuesday AM, a good (50%) chance of afternoon showers, then cloudy with a good (50%) chance of rain and snow Tuesday night and colder highs 48-59 falling to 53 Tuesday lows 39-45 cooling to near 40 Tuesday night. 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: Partly cloudy today, mostly cloudy tonight with a slight (20%) chance of rain late, a (40%) chance of AM coastal rain Monday and rain in the afternoon, a slight (20%) chance of AM rain inland, afternoon rain likely (60%) inland,  rain Monday night, rain likely (60%) Tuesday, then cloudy with a (40%) chance of rain Tuesday night lows 42-45 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 a slight (20%) chance of snow showers this AM, a mix of clouds and sun this afternoon, mostly cloudy with a slight (20%) chance of snow tonight, rain and snow likely (60%) Monday (5-10 in. of snow possible), rain and snow Monday night (6-12 in. of snow possible), rain and snow showers likely (60%) Tuesday (1-3 in. of snow possible), a good (50%) chance of snow showers Tuesday night free air freezing level 4,000 ft. today, snow level 3,000 ft. tonight, 4,500 ft. Monday and Monday night, 3,000 ft. Tuesday, and 2,500 ft. Tuesday night highs 40-45 falling to near 40 Tuesday lows 25-34 cooling to 26 Tuesday night. Mostly cloudy with snow showers Wednesday and Wednesday, showers Wednesday night, a good (50%) chance of snow showers Thursday, then a (40%) chance of rain and snow showers Thursday 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.