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A trough of low pressure (See “U” shape offshore) is keeping us in a cool moist airflow for quite some time. It will move across Oregon and a series of waves will push through the trough generating rain. A frontal system has across the Pacific Northwest bringing considerable rain. Another low will move down from along British Columbia continuing the wet weather pattern. The Autumnal Equinox occurs this 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 the 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: Mostly cloudy with a chance of evening thunderstorms, and a good (50%) chance of showers late tonight, AM clouds Monday, then a mix of clouds and sun with a (40%) chance of showers in the afternoon, partly cloudy with a slight (20%) chance of showers Monday evening, and fog developing late at night lows 50-46 high 72. AM fog then a mix of clouds and sun Tuesday and Wednesday, partly cloudy with patchy fog late Tuesday night, and mostly cloudy Wednesday night highs near 72 lows near 44-48. Mostly cloudy with a slight (20%) chance of rain Thursday afternoon and evening, a slight (20%) chance of rain Thursday night and Friday morning, a mix of clouds and sun and a bit warmer Friday afternoon and Saturday, partly cloudy Friday night and Saturday evening, then mostly cloudy with a slight (20%) chance of rain late Saturday night and Sunday AM, and a (40%) chance of rain Sunday afternoon highs 70-75 lows 48-52. (seasonal averages high 76 low 46)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy a good (50%) chance of showers and isolated thunderstorms this evening, mostly cloudy with a slight (20%) chance of showers tonight and Monday AM, mostly cloudy in the afternoon, partly cloudy in the evening, mostly cloudy with patchy fog late at night and Tuesday AM with a slight (20%) chance of morning showers, then mostly cloudy Tuesday afternoon, and partly cloudy with areas of fog late Tuesday night lows 53-47 highs 72-69. AM fog then partly cloudy Wednesday and Wednesday evening, then mostly cloudy with a slight (20%) chance of rain late Wednesday night and Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night, partly cloudy and warmer Friday through Saturday evening, then mostly cloudy with a slight (20%) chance of rain late Saturday night and Sunday highs 69-79 lows 50-54. (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 a (40%) chance of showers tonight, mostly cloudy a (20%) chance of showers early in the day then partly cloudy through Monday evening, mostly cloudy with areas of fog late at night, mostly cloudy with a slight (20%) chance of showers Tuesday AM with coastal fog, partly cloudy Tuesday afternoon inland, partly cloudy with areas of patchy fog Tuesday night lows 54-46 highs 63-65. Patchy fog Wednesday AM, partly cloudy in the afternoon and evening, mostly cloudy with a (30%) chance of rain late Wednesday night, mostly cloudy with a slight (20%) chance of rain Thursday and a slight (20%) chance of showers Thursday night highs 65-62 lows 49-54. Mostly cloudy Friday morning, partly cloudy Friday afternoon through Saturday AM, mostly cloudy Saturday afternoon, a slight (20%) chance of rain late Saturday night, and mostly cloudy with a (30%) chance of rain Sunday highs 64-70 lows near 53. (seasonal averages high 67 lows 50).
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Forecast for the Cascades of Lane County: Cloudy showers likely (60%) and colder tonight with a slight (20%) chance of thunderstorms this evening, mostly cloudy Monday AM, a mix of clouds and sun with a good (50%) chance of showers in the afternoon and evening, mostly cloudy with a slight (20%) chance of showers late Monday night snow level 8,000 ft. lows 40-37 high 58. AM clouds with a slight (20%) chance of showers, then a mix of clouds and sun Tuesday, partly cloudy Tuesday night, a mix of clouds and sun and warmer Wednesday, partly cloudy in the evening, mostly cloudy Wednesday night and Thursday afternoon and evening, a slight (20%) chance of rain Thursday night and Friday AM, a mix of clouds and sun Friday afternoon, and partly cloudy Friday night snow level 8,000 ft. Tuesday, a free air freezing level 9,000 ft. Tuesday night through Wednesday night, then a snow level of 8,000 ft. Thursday through Friday and back to a free air freezing level of 10,000 ft. Friday night highs 63-59-56- lows 40-34. A mix of clouds and sun Saturday, partly cloudy with a slight (20%) chance of showers Saturday night and Sunday AM, then mostly cloudy with a (30%) chance of rain Sunday afternoon free air freezing level 10,000 ft. Saturday then a snow level above 8,000 ft. Saturday night and Sunday highs near 62 low 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.