Here is my new weekly weather quiz question for this week. Who discovered Halley’s comet? Please post your answer as a comment after the forecasts. The first person to post the correct answer will win one free week of personalized forecasts tailored to your needs. Good luck.

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An upper level trough of low pressure (Shaded area into Southern California then the east side of “U” is formed by the blue arrows). A  frontal system is moving in and will push northeastward. By Wednesday another stronger frontal system will be poised to bring 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: Mostly cloudy with showers likely (60%)  tonight and a chance of evening thunderstorms, then mostly cloudy with a good (50%) chance of showers Tuesday and a slight (20%) chance of showers Tuesday evening and a good (50%) chance at night lows 47-45 high near 60 . Cloudy with a good (50%) chance of rain Wednesday morning then rain in the afternoon and showers likely (60%) Wednesday night high 65 low 42. Mostly cloudy with a good (50%) chance of showers Thursday through Friday and a (30%) chance Friday night through Monday highs 56-64  lows 40-45.

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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with isolated thunderstorms this evening and showers likely (60%) tonight low 47. Mostly cloudy with a good (50%) chance of showers Tuesday and a  (30%) chance of rain late Tuesday night high 63 low 46. Rain likely (60%) Wednesday morning then rain Wednesday afternoon, evening showers, then showers likely (60%) late at night high 67 low 42 . Mostly cloudy with a good (50%) chance of showers Thursday, and showers likely (60%) Thursday night high 62 low 42. Mostly cloudy with a good (50%) chance of showers and cooler Friday and Friday night high 54 low 40. Mostly cloudy with a (30%) chance of showers Saturday through Monday highs 60-68 lows 42-46.

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with showers likely (60%) this evening a good (50%) chance tonight low 50. Mostly cloudy with showers likely (60%) Tuesday AM and a (20%) chance in the afternoon then a good (50%) chance of rain Tuesday night high 55 low 48. Morning rain likely (60%) Wednesday then rain in the afternoon, showers likely (60%) in the evening and a good (50%) chance of showers overnight  highs 62 lows 43. Mostly cloudy with a (50%) chance of showers  Thursday, showers likely (60%) Thursday night through Friday night highs 58-52 lows 4642 . Mostly cloudy with a  (30%) chance of showers Saturday through Monday highs 55-60 lows near 47 .

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Forecast for the Cascades of Lane County:  Mostly cloudy showers tonight and scattered evening thunderstorms then a (30%) chance of thunderstorms late at night snow level above 8,000 ft. falling to 7,000 ft. late tonight low 35. Mostly cloudy with showers likely (60%) Tuesday morning and a (40%) chance of afternoon and evening showers then a slight (20%) chance of showers overnight snow level 6,500 ft. falling to 6,000 ft. then 5,500 ft. at night high 49 low 32. Mostly cloudy with a (30%) chance of morning rain, then rain Wednesday afternoon and evening and showers likely (60%) late Wednesday night snow level 7,000 ft. falling to 5,500 ft. in the evening and to 3,500 ft. late at night high near 50 low 30. Rain and snow showers likely (60%) Thursday and Thursday night snow level 3,000 ft. high 40 low 26 . Mostly cloudy with showers likely (60%) Friday snow level 3,500 ft. high 34 . Mostly cloudy with a (40%) chance of rain and snow showers Friday night through Saturday night snow level 3,500 ft. rising to 5,000 ft. Saturday night lows 26-30 highs 35-44 . Mostly cloudy with a (30%) chance of showers Sunday through Monday snow level 6,000 ft. Sunday falling to 5,500 ft. Sunday night and Monday highs 46-50 low 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.