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The upper air flow trough of low pressure (“U” shape shaded area over the Pacific Northwest)  is setting up over us with a lot of Pacific moisture with it.  A cold front is moving through the region and is bringing more rain and possible freezing rain back to the area through the weekend. Monday should dry out and turn colder as a second cold front drops down from the north, but that won’t last as more disturbances will start moving in. With the colder air already here that could mean a winter mix o rain and snow even down to the valleys next week.

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Advisories:  A FREEZE WARNING IS IN EFFECT FROM 1 AM UNTIL 9 AM  MONDAY FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST.

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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 showers today (snow level 500 ft -1,000 ft.), and a slight (20%) chance of showers this evening (snow level 1,000 ft. in the evening), just mostly cloudy tonight, AM clouds, then a mix of clouds and sun Monday, partly cloudy Monday night, a mix of clouds and sun Tuesday with a slight (20%) chance of snow, then snow likely (60%) Tuesday night highs 42-34 lows 28-24 and back to 32 Tuesday night. Rain Wednesday and Wednesday night, rain likely (60%) Thursday, showers likely (60%) Thursday night and Friday, then rain likely (60%) Friday night and Saturday highs 42-49 lows 38-30. (seasonal averages highs 46 low 33)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with patchy fog and freezing fog early this AM (snow level 1,500 ft.), mostly cloudy with a (40%) chance of rain and snow showers this afternoon (snow level 1,500 ft. rising to 2,000 ft. in the afternoon),  a slight (20%) chance of rain and snow showers this evening with patchy fog and freezing fog late at night and Monday AM (snow level 2,000 ft. in the evening), and mostly cloudy Monday AM, partly cloudy Monday afternoon and Monday night with areas of fog and freezing fog highs 38-42 lows 29-25. AM fog and freezing fog, then mostly cloudy with a slight (20%) chance of rain Tuesday afternoon, rain likely (60%) Tuesday night, rain Wednesday and Wednesday night, then mostly cloudy with  rain likely (60%) Thursday through Saturday highs 53-44 and back to 49 Saturday lows 34-42. (seasonal averages high 49 low 35)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly cloudy with a (40%) chance of  coastal showers today, a (30%) chance of AM rain and snow showers inland, then a (40%) chance of afternoon showers (snow level 500 ft. rising to 2,000 ft. in the afternoon), a slight (20%) chance of coastal showers tonight and a slight (20%) chance of evening showers inland (snow level 2,000 ft. in the evening), then just mostly cloudy Monday AM, partly cloudy Monday afternoon and Monday night highs 43-46 lows 32-28. Mostly cloudy with a slight (20%) chance of rain Tuesday, then rain likely (60%) Tuesday night, rain Wednesday and Wednesday night, rain likely (60%) and breezy Thursday, rain likely (60%) Thursday night, then rain likely (60%) Friday through Saturday highs 44-52 lows 39-45. (seasonal averages high 52 lows 39).

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Forecast for the Cascades of Lane County:  Mostly cloudy with a (40%) chance of snow showers this AM, then afternoon snow showers likely (60%), a (30%) chance of snow showers tonight, a mix of clouds and sun Monday with a slight (20%) chance of AM snow showers, then partly cloudy Monday night, a mix of clouds and sun Tuesday with a slight (20%) chance of snow in the afternoon, and snow likely (60%) Tuesday night snow level at the surface tonight through Monday, free air freezing level at the surface Monday night, back to a snow level at the surface Tuesday and Tuesday night highs 24-32 lows 14-10 rising to 25 Tuesday night. Mostly cloudy with snow and rain South of Sisters and snow to the North Wednesday,  rain with snow and freezing rain Wednesday night, rain with snow and freezing rain likely (60%) Thursday, rain and snow showers likely (60%) Thursday night, snow showers likely (60%) Friday, snow and rain likely (60%) Friday night and Saturday snow level 2,500 ft. Wednesday, 4,500 ft. Wednesday night, 5,000 ft. Thursday, 3,500 ft. Thursday night, 2,500 ft. Friday, 3,000 ft. Friday night, and rising to 5,000 ft. Saturday highs 36-32 warming to 35 Saturday lows 33-26.

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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.