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A trough of low pressure (See “U” shape offshore) is setting up over the Pacific Ocean and will stay offshore keeping in a cool moist airflow for quite some time. A series of waves will push through the trough generating rain. A frontal system will be moving cooler moist air across the Pacific Northwest bringing increased chances for rain. The Autumnal Equinox occurs next Wednesday at 8:09 PM beginning the Fall season and the full Harvest moon reveals itself in the early morning hours of Thursday September 23rd. A series of frontal systems will be approaching the coast toward the end of next week for even more wet Autumn weather.
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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: Cloudy with rain tonight and possible thunderstorms late tonight, AM rain likely (60%) and a bit cooler Sunday, showers likely (60%) with a slight (20%) chance of afternoon and evening thunderstorms, and a good (50%) chance of showers Sunday night, AM clouds Monday, then a mix of clouds and sun with a (40%) chance of showers, partly cloudy with a slight (20%) chance of showers Monday evening, and fog developing late at night lows 58-46 highs 68-70. AM fog then a mix of clouds and sun Tuesday and Wednesday, partly cloudy with patchy fog late Tuesday night, and a slight (20%) chance of rain late Wednesday night highs lows. Partly cloudy with a slight (20%) chance of rain Thursday AM, mostly cloudy with a (30%) chance of rain Thursday afternoon through Friday morning, mostly cloudy with a slight (20%) chance of rain Friday afternoon and evening, then a (30%) chance of rain Friday night and a slight (20%) chance Saturday highs 69-73 lows 48-52. (seasonal averages high 76 low 46)
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Forecast for the Umpqua Basin including, Roseburg: Cloudy with rain and a slight chance of thunderstorms this evening, then rain tonight through Sunday AM, showers with a slight (20%) chance of thunderstorms Sunday afternoon and evening, a good (50%) chance of showers late Sunday night, mostly cloudy with a slight (20%) chance of showers Monday and Monday evening lows 58-50 highs 67-72. AM clouds, then partly cloudy Tuesday, partly cloudy Tuesday night with a slight (20%) chance of showers , partly cloudy Wednesday AM, then mostly cloudy in the afternoon with a slight (20%) chance of showers Wednesday afternoon through Saturday highs 72-76 lows 50-55. (seasonal averages high 80 low 49)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with rain tonight and Sunday AM, coastal showers likely (60%) in the afternoon, showers and a slight (20%) chance of thunderstorms in the afternoon inland, mostly cloudy with a (40%) chance of coastal showers Sunday night, a (20%) chance of showers and a slight (20%) chance of thunderstorms in the evening inland and a (%) chance of showers late Monday night lows 56-50 highs 62-64. Mostly cloudy Tuesday and Tuesday night, mostly cloudy with a slight (20%) chance of showers Wednesday, then mostly cloudy with a (30%) chance of rain Wednesday night through Friday highs 62-65 lows 50-54. (seasonal averages high 67 lows 50).
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Forecast for the Cascades of Lane County: Cloudy with rain and a slight (20%) chance of thunderstorms tonight and Sunday AM, showers with a slight (20%) chance of thunderstorms Sunday afternoon and evening, showers likely (60%) and colder Sunday night and Monday AM, a good (50%) chance of showers in the afternoon and evening, and a slight (20%) chance of showers late Monday night snow level above 8,000 ft. tonight, 8,000 ft. Sunday through Monday night lows 45-36 highs 56-58. AM clouds then a mix of clouds and sun with a slight (20%) chance of showers Tuesday, partly cloudy Tuesday with a slight (20%) chance of showers Tuesday night, a mix of clouds and sun and warmer with a (30%) chance of showers Wednesday morning, a slight (20%) chance of rain in the afternoon, partly cloudy a slight (20%) chance of rain late Wednesday night and Thursday AM, mostly cloudy with a (40%) chance of rain Thursday afternoon through Friday AM, a slight (20%) chance of rain in the afternoon and evening, then a slight (20%) chance of rain late Friday night and Saturday snow level 8,000 ft. through Thursday night then above 8,000 ft. Friday through Saturday highs 62-58 lows 39-42.
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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.