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The upper air flow (yellow jet stream and dark colors for winds) shows a  low (yellow circle) developing and moving through California as a frontal system moved slowly away from the Pacific Northwest with colder air behind it. A high pressure ridge (the “Arch” shape on the yellow line) will keep us dry with some sunshine for a while.

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Advisories:  NONE AT THIS TIME.

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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: Partly cloudy with patchy fog and freezing fog again early this AM, a mix of clouds and sun this afternoon, patchy late night and early AM fog and freezing fog, then a mix of clouds and sun Sunday, Monday and Tuesday, partly cloudy each night highs 38-42 lows 24-30. Just mostly cloudy Wednesday through Thursday, then mostly cloudy with a (40%) chance of rain Thursday night, a good (50%) chance of rain Friday through Saturday highs 45-50 lows 35-40. (seasonal averages highs 45 low 32)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with patchy fog and freezing fog late this AM, mostly sunny  in the afternoon and partly cloudy tonight with areas of fog and freezing fog late at night and early Monday AM and Tuesday AM, partly cloudy both  days and nights highs 42-48 lows near 32. Just mostly cloudy Wednesday through Thursday, mostly cloudy with a (40%) chance of rain Friday and Friday night, then mostly cloudy with a (40%) chance of showers Saturday highs 53-48 lows near 38-30. (seasonal averages high 49 low 34)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with patchy inland fog and freezing fog this AM, mostly sunny  in the afternoon and partly cloudy with areas of fog tonight and Monday AM, sunny Monday afternoon, mostly clear with areas of fog late Monday night and Tuesday AM, partly cloudy Tuesday afternoon and mostly cloudy at night highs near 50 lows 33-37. Just mostly cloudy Wednesday through Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night, a (50%) chance of rain Friday and Friday night, then mostly cloudy with a good (50%) chance of showers Saturday highs 54-50 lows near 37-43. (seasonal averages high 52 lows 39).

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Forecast for the Cascades of Lane County: A mix of clouds and sun today through Tuesday, partly cloudy each night free air freezing level 2,500 ft. rising to 3,000 ft. this afternoon and tonight, 3,500 ft. Monday and Monday night, 4,500 ft, Tuesday, and 4,000 ft. Tuesday night highs 28-32 lows 17-26. Mostly cloudy Wednesday, a slight (20%) chance of rain and snow Wednesday night and Thursday, then a good (50%) chance of rain and snow Thursday night through Saturday free air freezing level 5,000 ft. Wednesday, snow level  4,000 ft. Wednesday night and Thursday, 3,500 ft. Thursday night, and rising to 5,000 ft. Friday, 5,500 ft. Friday night, and 4,500 ft. Saturday highs 33-39 lows near 28.

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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.