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Advisories: NONE AT THIS TIME.
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An upper air trough of low pressure (“U” shape over the Pacific Northwest) is ushering in a moist marine airflow pushing many more clouds our way. As a frontal system moves through it should produce some showers possibly as soon as this evening ahead of the front. More frontal systems will march through giving us the Autumn weather that comes with the season and the Autumnal Equinox which occur at 2:05 AM PDT Thursday. I don’t know about you, but I have been seeing trees turning colors and losing their leaves for the past month which seems to indicate that Autumn-like cloud cover and low temperatures that we had for the latter part of this Summer triggered an early start to the Fall season.
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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 with increasing clouds to mostly cloudy today, mostly cloudy tonight with a slight (20%) chance of rain approaching from the West, mostly cloudy with a slight (20%) of rain Sunday AM, a slight (20%) chance of showers Sunday afternoon and evening, partly cloudy with a slight (20%) chance of showers Sunday night and Monday AM, then partly cloudy Monday afternoon and Monday night highs 72-77 lows 50-55 cooling to near 50 Monday night. Partly cloudy Tuesday through Friday highs near 80 lows near 52. (seasonal averages high 77 low 47)
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Forecast for the Umpqua Basin including Roseburg: Partly cloudy today, mostly clear in the evening, mostly cloudy tonight and Sunday AM, partly cloudy Sunday afternoon and evening, mostly cloudy with a slight (20%) chance of showers late Sunday night and Monday AM, then partly cloudy Monday afternoon and Monday night highs 75-82 lows 48-55. Partly cloudy Tuesday through Friday highs 80-85 lows near 53. (seasonal averages high 79 low 51)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy this AM with patchy coastal fog, partly cloudy in the afternoon and evening, mostly cloudy late tonight, a slight (20%) chance of coastal rain Sunday AM then a slight (20%) chance of showers Sunday afternoon and evening, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers inland Sunday night, mostly cloudy at the shore with a slight (20%) chance of showers late at night, mostly cloudy Monday AM, partly cloudy with a slight (20%) chance of showers Monday afternoon and evening, then mostly cloudy with patchy fog late Monday night highs 63-66 lows 50-55. Mostly cloudy with patchy fog Tuesday AM, partly cloudy Tuesday afternoon through Wednesday evening, mostly cloudy with patchy late at night and early AM fog Wednesday night through Friday highs near 64 lows near 52. (seasonal averages high 65 low 50).
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Forecast for the Cascades of Lane County: A mix of clouds and sun today, partly cloudy in the evening, mostly cloudy tonight through Sunday evening, partly cloudy with a slight (20%) chance of showers late Sunday night, a mix of clouds and with a slight (20%) chance of showers Monday AM, mostly sunny Monday afternoon, and mostly clear Monday night free air freezing level 9,000 ft. today, 11,000 ft. tonight and Sunday, snow level above 8,000 ft. Sunday night and Monday, then free air freezing level of 14,000 ft. Monday night highs 58-67 lows 42-46. Mostly sunny Tuesday, partly cloudy Tuesday night and Wednesday AM, mostly sunny Wednesday afternoon, then partly cloudy Wednesday night through Friday free air freezing level 14,000 ft. Tuesday through Wednesday night, 13,000 ft. Thursday, 14,000 ft. Thursday night, and 13,000 ft. Friday highs 70-63 lows near 46.
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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.
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