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An upper level trough of low pressure (Shaded area then the east side of “U” is formed by the blue arrows). That means the airflow is from the Southwest which brings in more moisture and a new frontal system that will move in from the Northwest. By Wednesday another stronger frontal system will be poised to push more rain into Oregon.

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Advisories:  NONE AT THIS TIME

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The Pollen Count Forecast for the Eugene-Springfield area : Trees MODERATE, Grass LOW, weeds Absent.

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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 this evening with scattered showers and a slight (20%) chance of thunderstorms then becoming mostly cloudy with a slight (20%) chance of showers overnight tonight low 48. Mostly cloudy with a  (30%) chance of AM showers then showers likely (60%)  Monday afternoon and evening and a (40%) chance of showers Monday night high 68 low 47. Mostly cloudy with a (30%) chance of showers Tuesday with a slight (20%) chance in the evening and a (30%) chance of rain Tuesday night high near 63 low near 46. Mostly cloudy with rain redeveloping Wednesday morning and a good (50%) chance of showers Wednesday night and (40%) Thursday through Friday night highs 65-56 lows 42-40. Mostly cloudy Saturday morning then a mix of clouds and sun and a (20%) chance of showers and (30%) Saturday night and Sunday highs 60-64 low 42.

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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with a slight (20%) chance of showers tonight low 52 . Mostly cloudy with a (50%) chance of showers Monday AM then showers likely (60%) in the afternoon and Monday night high 65 low 48. Mostly cloudy with a (30%) chance of showers Tuesday, a slight (20%) chance in the evening and a good (50%) chance late Tuesday night high 65 low 47. Rain likely (60%) Wednesday morning then rain Wednesday afternoon high 62. Mostly cloudy with a good (50%) chance of showers Wednesday night through Thursday night, (40%) Friday and Friday night, (30%) Saturday through Sunday lows 44-40 and 45 Saturday night highs 56-64   .

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a slight (20%) chance of evening showers inland and a slight (20%) chance of showers overnight at the shore low near 49. Mostly cloudy with a (40%) chance of showers Monday AM then showers likely (60%) in the afternoon and at night high 60 low 50. Mostly cloudy with a (30%) chance of showers Tuesday and a slight (20%) chance Tuesday evening and a likely (60%) at night high 55 low 46. Rain likely (60%) Wednesday AM then afternoon rain high 54. Mostly cloudy with a good (50%) chance of showers Wednesday night through Thursday night, (40%) Friday and Friday night, and (30%) Saturday through Sunday lows 46-40 then 47 Saturday night highs 50-57.

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Forecast for the Cascades of Lane County:   Mostly cloudy with showers likely (60%) and isolated thunderstorms this evening then a (40%) chance of showers tonight snow level above 8,000 ft. low 42. Mostly cloudy showers likely (60%) with isolated afternoon and evening thunderstorms Monday and showers decreasing at night snow level above 8,000 ft. falling to 7,000 ft. then 6,000 ft. at night high near 60 low 35. Mostly cloudy with a (40%) chance of showers Tuesday and Tuesday evening then a (40%) chance of rain overnight snow level 7,000 ft. falling to 6,500 ft. at night high 49 low 34. Mostly cloudy with rain redeveloping by late Wednesday morning and showers likely (60%) Wednesday night through Thursday night snow level 7,000 ft. falling to  5,500 ft., 4,000 ft. late Wednesday night, and near 3,000 ft. Thursday and Thursday night highs 46-42 lows 32-28. Mostly cloudy with a (30%) chance of showers Friday through Sunday snow level 3,500 ft. Friday and Friday night, 4,000 ft. Saturday, 5,000 ft. Saturday night, and 6,000 ft. Sunday highs 45-50 lows near 30 .

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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.