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My weekly weather quiz question will start tomorrow instead of today due to the holiday.

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A trough of low pressure (See “U” shape offshore) is building over the Pacific Northwest  keeping us cooler than average for a while. A cold front will be moving in by Friday with a little warming next 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: AM clouds then a mix of clouds and sun today (Labor Day), partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late tonight,  mostly cloudy with a good (50%) chance of showers Tuesday and Tuesday evening, a slight (20%) chance of showers late Tuesday night, a (30%) chance of showers Wednesday, mostly cloudy in the evening, partly cloudy with a slight (20%) chance of showers late Wednesday night highs 74-69-64 lows 50-48 . Partly cloudy with a slight (20%) chance of showers Thursday through Friday evening, a mix of clouds and sun Saturday, partly cloudy with a slight (20%) chance of showers Saturday night, then A mix of clouds and sun Sunday with a slight (20%) chance of AM showers highs 73-77 lows near 50. (seasonal averages high 79 low 49)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy today (Labor Day), partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late tonight,  mostly cloudy with at (40%) chance of showers Tuesday and a good (50%) chance of showers Tuesday night highs 77-70 lows 50-55. Mostly cloudy with a good (50%) chance of showers Wednesday, (30%) Wednesday night, and a slight (20%) chance Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night and Friday, mostly cloudy Friday night and Saturday, and mostly cloudy Saturday night and Sunday with a slight (20%) chance of showers highs 70-75 lows 49-53. (seasonal averages high 84 low 52)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Partly cloudy today (Labor Day),  mostly cloudy tonight with a (30%) chance of showers at the shore and a slight (20%) chance of showers late at night inland, mostly cloudy with a (40%) chance of showers Tuesday inland,  AM showers and afternoon showers likely (60%) at the shore, cloudy Tuesday night with a good (50%) chance of showers inland, evening showers likely (60%) at the shore then a good (50%) chance of showers late at night highs 64-62 lows 49-53. Mostly cloudy with showers likely (60%) Wednesday, then mostly cloudy with a (20%) chance of showers Wednesday night through Friday,  mostly cloudy Friday night, then mostly cloudy with a slight (20%) chance of showers Saturday through Sunday highs 60-65 lows 53-49. (seasonal averages high 68 low 51).

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Forecast for the Cascades of Lane County:  A mix of clouds and sun in the AM, mostly cloudy  with a slight (20%) chance of afternoon and evening showers today (Labor Day), then a (20%) chance of showers tonight (mainly North), scattered showers Tuesday, showers likely (60%) Tuesday evening, then a good (50%) chance of showers at night free air freezing level 10,000 ft. tonight, snow level above 8,000 ft. Monday and Monday night, then 8,000 ft. Sunday night through Tuesday night highs 60-56 lows 38-32. Mostly cloudy and colder Wednesday with a (30%) chance of showers, mostly cloudy in the evening, partly cloudy with a (20%) chance of showers late Wednesday night, a mix of clouds and sun Thursday with a (%) chance of AM showers and a slight (20%) chance of afternoon showers, partly cloudy with a slight (20%) chance of showers Thursday night through Friday evening, snow level 7,000 ft. Wednesday and 8,000 ft. Wednesday night highs 49-59 lows 36-40. A mix of clouds and sun Saturday, partly cloudy with a slight (20%) chance of showers Saturday night, then a mix of clouds and sun Sunday with a slight (20%) chance of morning showers free air freezing level 10,000 ft.  Saturday, snow level above 8,000 ft. Saturday night and Sunday highs 58-62 low near 40.

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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.