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Upper level low pressure (“U” shape offshore) is sliding to the South and will move Eastward changing our airflow from Westerly to Easterly sending warmer dry air at us from the East and Southeast. A frontal system will pass South of us and should bring us only some more clouds by Sunday. The weather looks fine for the main events of the Prefontaine Classic today as summer-like temperatures bathe us for a day or two. The shower chances will return by late Monday and Monday night.
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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 sunny and much warmer today, partly cloudy tonight through Sunday evening with a slight (20%) chance of thunderstorms Sunday evening, becoming mostly cloudy late Sunday night with a slight (20%) chance of showers, then mostly cloudy and cooler Monday, a slight (20%) chance of showers Monday night highs 85-64 lows 52-46. Mostly cloudy with a slight (20%) chance of showers Tuesday through Wednesday, just mostly cloudy Wednesday night, a mix of clouds and sun Thursday, then mostly cloudy Thursday night, and a mix of clouds and sun Friday highs 63-70 lows near 44. (seasonal averages high 70 low 45)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy this AM, partly cloudy this afternoon, mostly cloudy tonight with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of AM showers Sunday, a (30%) chance of showers and a slight (20%) chance of thunderstorms Sunday afternoon and evening, a slight (20%) chance of showers Sunday night, mostly cloudy with a (30%) chance of showers Monday, a slight (20%) chance of showers Monday night highs 84-65 lows 54-47. Mostly cloudy with a slight (20%) chance of showers Tuesday through Wednesday, mostly cloudy Wednesday night, then partly cloudy Thursday through Friday highs 70-74 lows 50-45. (seasonal averages high 75 low 49)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy today, mostly cloudy with a slight (20%) chance of showers tonight, mostly cloudy with a (30%) chance of coastal showers Sunday and Sunday night, a slight (20%) chance of inland AM showers, a (30%) of showers and a slight (20%) chance of showers and thunderstorms Sunday and Sunday evening, with a slight (20%) chance of showers late Sunday night through Monday night highs 74-56 lows 52-47. Mostly cloudy with a slight (20%) chance of showers Tuesday through Wednesday, just mostly cloudy Wednesday night and Thursday, then partly cloudy Thursday night and Friday highs near 58 lows 49-45. (seasonal averages high 63 low 49).
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Forecast for the Cascades of Lane County: Partly cloudy and warmer today and tonight, a mix of clouds and sun with a slight (20%) chance of afternoon and evening thunderstorms, mostly cloudy with a slight (20%) chance of showers late Sunday night, then mostly cloudy with a (40%) chance of showers Monday and Monday night free air freezing level 11,000 ft. today and tonight, snow level above 8,000 ft. Sunday through Monday (0.25 in. of rain possible Monday night (0.25 in. of rain possible Monday night) highs 69-50 lows 45-30. Mostly cloudy with a slight (20%) chance of showers Tuesday through Wednesday, a slight (20%) chance of showers Wednesday night through Thursday night, then partly cloudy with a (30%) chance of showers Friday snow level 8,000 ft. Tuesday, 5,500 ft. Tuesday night and Wednesday, 6,500 ft. Wednesday night, and rising to 7,000 ft. Thursday and Thursday night, then above 8,000 ft. Friday highs 45-60 lows 32-35.
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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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