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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 is right behind it. As the upper level low pressure trough migrates Eastward across Oregon the chance of rain will also increase for a while, then later in the week more high pressure returns the sunshine and warmer temperatures.
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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 tonight, mostly cloudy Monday with a slight (20%) chance of morning rain, a (40%) chance of afternoon rain, mostly cloudy Monday night, AM clouds then a mix of clouds and sun Tuesday, and mostly clear Tuesday night lows 47-44 highs 65-70. A mix of clouds and sun Wednesday through Friday, partly cloudy nights, and partly cloudy with a slight (20%) chance of rain Saturday, then mostly cloudy with a slight (20%) chance of rain Saturday night and Sunday highs hovering between 74-68 lows 46-50 . (seasonal averages highs 70 low 43)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with a slight (20%) chance of showers late tonight, mostly cloudy with a (30%) chance of showers Monday and Monday evening, mostly cloudy Tuesday morning, sunny and warmer in the afternoon, and partly cloudy Tuesday night lows 47-44 high 67-72. Partly cloudy Wednesday through Friday night, and mostly cloudy Saturday through Sunday highs hovering between 72-74 lows 45-48. (seasonal averages high 75 low 46)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a (30%) chance of showers late tonight through Monday evening, mostly cloudy Tuesday morning, then partly cloudy Tuesday afternoon and night lows 47-52 highs 60-67. Partly cloudy Wednesday through Thursday night, and mostly cloudy Friday through Sunday highs hovering from 62-66 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 tonight, a slight (20%) chance of rain Monday morning, a (40%) chance of rain in the afternoon, a slight (20%) chance of showers at night, a mix of clouds and sun and warmer Tuesday and mostly clear Tuesday night snow level 7,000 ft. tonight, falling to 6,000 ft. Monday and back up to 6,500 ft. Monday night, free air freezing level rising to 11,000 ft. Tuesday afternoon, rising to 12,000 ft at night lows 33-40 highs 52-60. A mix of clouds and sun Wednesday through Friday with partly cloudy nights free air freezing level 13,000 ft. Wednesday, 12,000 ft. Wednesday night, falling to 11,000 ft. Thursday and Friday highs 63-56-62 lows near 42. Partly cloudy with a slight (20%) chance of rain Saturday, then mostly cloudy with a slight (20%) chance of rain Saturday night and Sunday snow level above 8,000 ft. highs 63-57 low 43.
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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.