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A trough of low pressure (See “U” shape offshore) is moving Eastward away from us. A weak frontal system (moving down from the northwest) will be moving in shortly. Weak high pressure will take over for a little warming Sunday and Monday, but another low will follow close behind it so don’t look for any dramatic changes in our weather patterns. Another frontal system will be approaching the Pacific Northwest late in the week bringing a chance for more rain.

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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 clear tonight, a mix of clouds and sun Sunday and Monday, partly cloudy Sunday night, mostly clear Monday night lows 42-50 highs 80-82. Mostly sunny Tuesday, mostly clear Tuesday night, a mix of clouds and sun and cooler Wednesday, partly cloudy with a slight (20%) chance of showers late Wednesday night through Friday evening highs 80-74 lows near 51. Mostly cloudy with a (20%) chance of rain late Friday night and Saturday low 49 high 72. (seasonal averages high 78 low 48)

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Forecast for the Umpqua Basin including, Roseburg: Mostly clear  tonight, and partly cloudy Sunday through Monday, partly cloudy with a slight (20%) chance of evening thunderstorms, partly cloudy with a slight (20%) chance of showers and cooler Tuesday afternoon, partly cloudy in the evening, then mostly cloudy Tuesday night lows 50-55 highs 83-79. Partly cloudy with a slight (20%) chance of showers Wednesday and Wednesday night,  mostly cloudy with a slight (20%) chance of showers Thursday, then mostly cloudy with a slight (20%) chance of rain late Thursday night highs 80-78 lows near 56. Mostly cloudy with a (40%) chance of rain  and cooler Friday through Saturday highs 77-70  lows near 55. (seasonal averages high 83 low 51)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly clear tonight, partly cloudy Sunday, mostly cloudy Sunday evening, partly cloudy with patchy coastal fog at night,  partly cloudy Monday, partly cloudy with a slight (20%) chance of showers Monday night inland, partly cloudy with a slight (20%) chance of showers Tuesday afternoon, partly cloudy with a slight (20%) chance of  evening thunderstorms, then a slight (20%) chance of showers late Tuesday night lows 47-53 highs 65-62. Mostly cloudy with a slight (20%) chance of showers Wednesday through Thursday, then mostly cloudy with a (20%) chance of rain Thursday night through Saturday highs 65-62 lows near 53. (seasonal averages high 68 low 51).

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Forecast for the Cascades of Lane County:  Mostly clear tonight, a mix of clouds and sun Sunday, and partly cloudy Sunday night, mostly sunny Monday and Tuesday, and mostly clear at night free air freezing level 12,000 ft. falling to 11,000 ft. Monday night and Tuesday night lows 35-42 highs 68-70. A mix of clouds and sun with a slight (20%) chance of afternoon rain and cooler Wednesday, partly cloudy with a slight (20%) chance of rain Wednesday night through Friday evening snow level above 8,000 ft. highs 67-63 lows 42-44. Mostly cloudy with a (20%) chance of rain late Friday night and Saturday snow level above 8,000 ft. low 42 high 62.

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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.