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A strong upper level area of low pressure (oval shape offshore) is sending moisture to the Pacific Northwest. A frontal system that moved ashore through Northern California brought showers that moved from South to North over Oregon. Another frontal system will be approaching the coast Thursday. Another storm system will be upon us by Friday, followed by yet another frontal system over the weekend.
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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 showers likely (60%) this evening, a good (50%) chance showers late tonight (0.10 in. of rain possible), a good (50%) chance of showers Monday AM and afternoon with a slight (20%) chance of afternoon and evening thunderstorms, partly cloudy with a slight (20%) chance of showers late at night (under 0.10 in. of rain possible), a slight (20%) chance of showers in the AM, a good (50%) chance of showers Tuesday afternoon (under 0.10 in. of rain possible), a (40%) chance of evening showers, a slight (20%) chance of showers late Tuesday night, mostly cloudy Wednesday AM, a mix of clouds and sun in the afternoon with a slight (20%) chance of showers, just partly cloudy Wednesday night lows near 40 highs 56-63. A mix of clouds and sun and warmer Thursday, partly cloudy Thursday night, a mix of clouds and sun Friday, partly cloudy in the evening, then mostly cloudy with a (30%) chance of showers Friday night through Sunday highs 67-64 lows near 45. (seasonal averages high 67 low 43)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with showers tonight, a (30%) chance of AM showers Monday (snow level 3,500 ft. in the AM), then a good (50%) chance of showers and a slight (20%) chance of thunderstorms Monday afternoon and evening, a good (50%) chance of showers late Monday night (snow level 3,500 ft. late), a (40%) chance of showers Tuesday AM, showers likely (60%) with a slight (20%) chance of thunderstorms Tuesday afternoon and evening, then showers likely (60%) late Tuesday night lows 40-44 highs 60-66. Mostly cloudy with a slight (20%) chance of showers Wednesday AM, just partly cloudy Wednesday night through Thursday night, mostly cloudy with a slight (20%) chance of showers Friday and Friday night, then mostly cloudy with a (30%) chance of showers Saturday through Sunday highs 73-63 warming to 67 Saturday lows 46-50. (seasonal averages high 71 low 46)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy tonight with coastal showers this evening, scattered late tonight, showers inland tonight, mostly cloudy with a (40%) chance of coastal showers Monday and Monday night, a good (50%) chance of AM showers inland and then showers likely (60%) with a slight (20%) chance of thunderstorms Monday afternoon and evening, a good (50%) chance of showers late Monday night, mostly cloudy with a (40%) chance of showers Tuesday AM, showers likely (60%) Tuesday afternoon and evening, then a a good (50%) chance of showers late Tuesday night lows 46-42 highs near 55. Just mostly cloudy Wednesday through Thursday night, mostly cloudy with a slight (20%) chance of showers Friday and Friday night, then mostly cloudy with a (30%) chance of showers Saturday through Sunday highs 56-60 lows 44-48. (seasonal averages high 61 low 47).
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Forecast for the Cascades of Lane County: Mostly cloudy with showers and a slight (20%) chance of thunderstorms this evening, rain and snow showers and colder late tonight (2-4 in. of snow possible), a (30%) chance of rain and snow showers Monday AM, showers likely (60%) with a slight (20%) chance of thunderstorms this afternoon and evening (1 in. of snow possible), a (40%) chance of rain and snow showers late Monday night and Tuesday AM, showers likely (60%) with a slight (20%) chance of afternoon and evening thunderstorms (1 in. of snow possible), then a good (50%) chance of rain and snow showers late Tuesday night (1 in. of snow possible) snow level 3,500 ft. falling to 3,000 ft. late tonight, 3,000 ft. rising to 3,500 ft. Monday afternoon and Monday night, 3,500 ft. rising to 4,000 ft. Tuesday and Tuesday night lows near 30 highs 40-47. Mostly cloudy Wednesday AM, a mix of clouds and sun in the afternoon with a (30%) chance of showers Wednesday afternoon, partly cloudy with a slight (20%) chance of showers Wednesday evening, a mix of clouds and sun Thursday, partly cloudy Thursday night, partly cloudy Friday with a slight (20%) chance of showers, becoming mostly cloudy Friday evening, mostly cloudy with a (40%) chance of showers Friday night, then mostly cloudy with a (40%) chance of showers Saturday through Sunday snow level 4,000 ft. rising to 5,000 ft. Wednesday, 5,000 ft. Wednesday night, free air freezing level 9.000 ft. Thursday, 10,000 ft. Thursday night, snow level above 8,000 ft. Friday, 8,000 ft. Friday night, 6,000 ft. Saturday and Saturday night, then 6,500 ft. Sunday highs near 54 lows near 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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