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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 today. 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: Mostly cloudy today 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 tonight, mostly cloudy Monday with a good (50%) chance of showers, and a slight (20%) chance of showers Monday night highs 65-63 lows 49-46 . A mix of clouds and sun Tuesday through Saturday, and partly cloudy each night highs 70-73 lows 48-52 . (seasonal averages highs 70 low 43)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with patchy fog this 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 high 67-62 lows 50-47. 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 75 low 46)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Patchy fog early this AM, a slight (20%) chance of rain in the AM, a slight (20%) chance of showers this afternoon, mostly cloudy tonight with a (30%) chance of showers, AM showers likely (60%) Monday, 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 highs 60-63 lows 52-50.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 65 lows 48).
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Forecast for the Cascades of Lane County: Mostly cloudy with a slight (20%) chance of showers and colder today and tonight, 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. today and tonight, falling to 6,000 ft. Monday and back up to 6,500 ft. Monday night highs 56-50 lows 33-37. 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.