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The jet stream shows a trough of low pressure ( “U” shaped area) swinging through the Pacific Northwest with another one following behind it. A frontal system moved through the area bringing a mixture of sunshine  and wet weather. We’ll see another frontal system move in Tuesday followed by another Wednesday and Wednesday night. It’s been a long time coming, but a high pressure ridge (“arch” shape shown at the end of the jet stream movie) will build in late next week warming us up a bit so it will feel more like Spring. It’s about time.

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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 showers and a slight (20%) chance of thunderstorms this evening, a good (50%) chance of showers late tonight (0.10 in. of rain possible, more in thunderstorms), mostly cloudy Monday with a slight (20%) chance of showers, cloudy with a (40%) chance of evening rain, rain likely (60%) late Monday night (0.10 in. of rain possible), showers likely (60%) Tuesday, a (40%) chance of rain Tuesday night, partly cloudy with a (40%) chance of rain Wednesday, mostly cloudy with a slight (20%) chance of showers Wednesday night lows 40-43 highs 53-60. Partly cloudy with a slight (20%) chance of showers Thursday, mostly cloudy with a good (50%) chance of showers Thursday night through Friday night, (30%) Saturday, a slight (20%) chance of showers Saturday night, then a slight (20%) chance of showers Sunday highs 64-55 lows near 42. (seasonal  averages high 58 low 37)

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Forecast for the Umpqua Basin including, Roseburg:  Cloudy with showers this evening, a good (50%) chance of showers late tonight (snow level 3,000 ft.), mostly cloudy with a slight (20%) chance of showers Monday AM (snow level 3,000 ft.), mostly cloudy with a good (50%) chance of showers Monday night (snow level 3,000 ft. late), showers likely (60%) Tuesday (AM snow level 3,500 ft.),  a (30%) chance of  showers Tuesday night, a (30%) chance of AM rain Wednesday, then partly cloudy Wednesday night lows 40-45 highs 59-66. Partly cloudy Thursday, mostly cloudy with a slight (20%) chance of showers and warmer Wednesday, just partly cloudy Wednesday night and Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night,  a (40%) chance of rain Friday, a (30%) chance of showers Friday night through Saturday night, then partly cloudy with a slight (20%) chance of showers Sunday highs 68-55 lows 45-36. (seasonal averages high 61 low 39)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with showers this evening, a good (50%) chance of coastal showers late tonight, showers likely (60%) inland late at night, a slight (20%) chance of showers Monday AM, cloudy Monday night, a good (50%) chance of evening coastal showers, then rain likely (60%) Monday night, (30%) chance of rain inland, showers Tuesday, a (40%) chance of showers Tuesday night, a (30%) chance of AM rain Wednesday, then just partly cloudy Wednesday night lows 42-47 highs 54-61. Partly cloudy with a slight (20%) chance rain Thursday, a (30%) chance Thursday night, a (40%) chance of rain Friday, a (40%) chance of showers Friday night, (30%) Saturday and Saturday night, then partly cloudy with a slight (20%) chance of showers Sunday  highs 60-52 lows 45-40. (seasonal averages high 56 low 42).

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Forecast for the Cascades of Lane County: Mostly cloudy snow showers tonight (3-6 in. of snow possible), a good (50%) chance of rain and snow showers Monday, a good (50%) chance of snow and rain Monday night, rain and snow showers likely (60%) Tuesday (1-4 in. of snow possible),  a good (50%) chance of rain and snow showers Tuesday evening, rain and slow likely (60%) late Tuesday night (1-3 in. of snow possible), a (40%) chance of rain Wednesday, and a (30%) chance of showers Wednesday night snow level 2,500 ft. tonight, 3,500 ft. Monday through Tuesday, 4,500 ft. rising to 5,500 ft. late Tuesday night, then 6,500 ft. Wednesday, and 7,000 ft. Wednesday night lows 25-33 highs 37-47.  Partly cloudy with a (20%) chance of showers Thursday, mostly cloudy with a good (50%) chance of showers Thursday night, a good (50%) chance of rain and snow showers Friday, a (40%) chance of showers Friday night, then mostly cloudy with a (40%) chance of rain and snow showers Saturday, and a (30%) chance Saturday night and Sunday snow level 6,000 ft. Thursday  and Thursday night, 5,500 ft. Friday, 4,500 ft. Friday night,  3,500 ft. Saturday, 3,000 ft. Saturday night, and 3,500 ft. Sunday highs 50-40 lows near 32.

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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.