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A  high pressure ridge (shaded “Arch” shape over the Northwest) is moving away from us and a trough of low pressure (the shaded “U” shape along the coast) is moving in behind the ridge. A frontal system pushed into Oregon today and another will do the same Sunday. As the upper level low pressure trough migrates Eastward across Oregon the chance of rain will also increase 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 this evening, mostly cloudy tonight and Sunday with a slight (20%) chance of AM drizzle or sprinkles, cooler with a slight (20%) chance of afternoon showers, a slight (20%) chance of showers Sunday night, mostly cloudy Monday with a good (50%) chance of  showers, and a slight (20%) chance of showers Monday night lows 52-46  highs 65-63 . A mix of clouds and sun Tuesday through Saturday, and partly cloudy each night highs 70-73  lows 48-52 . (seasonal averages highs 72 low 43)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with patchy fog late tonight and Sunday AM  with a slight (20%) chance of AM rain and a slight (20%) chance of afternoon and night time showers, a good (50%) chance of showers Monday, then a slight (20%) chance of showers Monday night  lows 52-47 high 67-62.  Mostly cloudy Tuesday, then partly cloudy Tuesday night through Wednesday night,  sunny Thursday, partly cloudy  at night and Friday with a slight (20%) chance of afternoon showers, partly cloudy Friday night and Saturday highs 67-76 lows near 48. (seasonal averages high 76 low 47)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with a slight (20%) chance of rain late tonight and patchy fog late night and early Sunday AM, a slight (20%) chance of rain in the AM, a slight (20%) chance of showers Sunday afternoon, mostly cloudy Sunday night with a (30%) chance of showers, AM showers likely (60%) Monday AM, a good (50%) chance of afternoon showers, mostly cloudy with a slight (20%) chance of showers inland, and a slight (20%) chance of evening coastal showers lows 55-50 highs 60-63.Partly cloudy Tuesday through Thursday night,  partly cloudy with a slight (20%) chance of showers Friday afternoon, and mostly cloudy Saturday with a slight (20%) chance of afternoon showers highs hovering around 66 lows 50-54. (seasonal averages high 66 lows 48).

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Forecast for the Cascades of Lane County: Mostly cloudy with a slight (20%) chance of showers late tonight through Sunday night (colder),  a good (50%) chance of rain and cooler Monday, and a slight (20%) chance of showers and colder Monday night snow level above 8,000 ft. late tonight through Sunday night, falling to 6,000 ft. Monday and back up to 6,500 ft. Monday night lows 44-33-37 highs 56-50. A mix of clouds and sun Tuesday through Saturday,  and partly cloudy each night free air freezing level 10,000 ft. Tuesday, 12,000 ft. Tuesday night, 13,000 ft. Wednesday and Wednesday night, falling to 12,000 ft. Thursday, 11,000 ft. Thursday night and Friday, rising to 13,000 ft. Friday night, and 14,000 ft. Saturdsay highs hovering near 60 lows 40-45.

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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.