A cold front is moving through Eastern Oregon and behind it  a high pressure ridge (“Arch” shape over the Pacific  Northwest) will clear the skies and warm us up for a while then an upper level low (“U” shaped area in the jet stream) will slide in behind the ridge. Look for a stronger frontal system to roll across Oregon on Thursday bringing back the chance of precipitation.

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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: Mostly cloudy this evening, partly cloudy and cooler with patchy fog tonight and Monday AM, mostly sunny Monday afternoon (Columbus Day), mostly clear in the evening, then mostly cloudy with patchy fog late at night and early Tuesday and Wednesday AM, a mix of clouds and sun Tuesday and Wednesday afternoons, mostly cloudy Tuesday night, and partly cloudy Wednesday night lows 38-44 highs 62-68.  Partly cloudy with a slight (20%) chance of rain Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night and Friday, partly cloudy with a slight (20%) chance of rain Friday night through Saturday night, and mostly cloudy with a slight chance of rain Sunday highs 65-59 lows 45-40. (seasonal averages highs 67 low 41)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with a slight (20%) chance of rain this evening, partly cloudy with patchy fog late at night and Monday AM, sunny Monday afternoon (Columbus Day) and Tuesday, mostly clear Monday night, and clear Tuesday night lows 46-38 highs 65-73 Mostly sunny Wednesday, mostly clear Wednesday night, partly cloudy with a slight (20%) chance of rain Thursday, a slight (20%) chance of  showers Thursday night and Friday, just mostly cloudy Friday night, and mostly cloudy with a slight (20%) chance of showers Saturday through Sunday highs 75-62 lows 43-45-42-40. (seasonal averages high 71 low 45)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly cloudy this evening, partly cloudy tonight, sunny Monday (Columbus Day),  clear Monday night,  partly cloudy Tuesday AM, sunny Tuesday and Wednesday, partly cloudy both nights lows 46-40 warming to 44 Wednesday night highs 64-70.  Partly cloudy with a slight (20%) chance of rain Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night and Friday, just mostly cloudy Friday night, then mostly cloudy with a slight (20%) chance of showers Saturday through Sunday highs 63-58  lows 46-48. (seasonal averages high 64 lows 46).

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Forecast for the Cascades of Lane County:  Mostly cloudy with a (40%) chance of showers this evening, a slight (20%) chance of showers and colder tonight, mostly sunny Monday (Columbus Day), clear Monday evening, partly cloudy Monday night,  mostly sunny Tuesday, and clear Tuesday night snow level above 8,000 ft.. late tonight, free air freezing level 9,000 ft. rising to 11,000 ft. Monday, 11,000 ft. Monday night and Tuesday, and 13,000 ft. Tuesday night lows 34-32-37 highs 54-65. Mostly sunny Wednesday, partly cloudy at night,  partly cloudy with a slight (20%) of rain Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night and Friday, partly cloudy with a slight (20%) chance of rain Friday night through Saturday night, then mostly cloudy with a slight chance of rain Sunday free air freezing level 13,000 ft. Wednesday,  14,000 ft. Wednesday night, a snow level above 8,000 ft. Thursday through Friday, 8,000 ft. Friday night, through Saturday night, lowering to 6,500 ft. Sunday highs 69-47  lows 33-38-34-33.

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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.