A trough of Low Pressure ( the “U” shaped shaded area now just onshore) will slowly slide eastward giving us rain. The latest frontal system has pushed its way into Oregon. Low pressure is riding up the front side of the trough and that means the surface low is moving northward away from us. More frontal systems will move through over the weekend bringing valley rain and mountain snow.

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Advisories:  NONE AT THIS TIME.

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Forecast for the Central and  Southern Willamette Valley:  Patchy AM fog then a mix of clouds and sun today and partly cloudy with patchy fog tonight high near 50 low 37. Patchy fog Friday morning with increasing clouds and a (30%) chance of rain by late afternoon high near 53 . Mostly cloudy with rain Friday night low near 40. Mostly cloudy Saturday with showers likely (60%) and showers Saturday night high 49 low 38. Mostly cloudy rain likely (60%) Sunday through Wednesday  highs in the upper 40s to 50 lows in the upper 30s to 40.

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Forecast for the Umpqua Basin including Roseburg: AM fog and clouds today then mostly cloudy this afternoon high 50. Mostly cloudy this evening then partly cloudy with patchy fog late tonight  low 39. AM clouds and fog Friday then mostly cloudy  with a slight (20%)  of afternoon rain then rain overnight high 49 low 40. Cloudy with becoming likely (60%) Saturday and Saturday night high 52 low 37. Rain likely (60%) Sunday through Monday (Martin Luther King, Jr. Day) highs near 50 low near 40 Sunday night . Cloudy with rain Monday night low again near 40 . Rain Tuesday through Wednesday highs in the mid to upper 40s 47 low 38.

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Forecast for the South Oregon Coast:  AM fog, mostly cloudy today and cloudy with fog late tonight high 54 low 44. Areas of AM fog then mostly cloudy and breezy Friday with a slight (20%) chance of afternoon rain high 56. Rain and breezy by Friday night low 47. Rain likely (60%) Saturday at the coast a good (50%) chance inland high 52-54 and rain Saturday night low near 44.  Cloudy, rain likely (60%) and breezy Sunday through Monday (Martin Luther King, Jr. Day) highs 53-55 low 43-46. Rain Tuesday through Wednesday highs 50-53 low 42-45.

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Forecast for the Cascades of Lane County:  A mix of clouds and sun today free air freezing level 6,000′ rising to 6,500′ by afternoon. Partly cloudy tonight, free air freezing level rising to 7,500′. Partly cloudy Friday with a slight (20%) chance of rain toward evening snow level falling to 6,000′. Becoming cloudy Friday night with rain likely (60%) snow level 5,000′ . Mostly cloudy Saturday rain and snow showers likely (60%) snow level 4,500′ and likely (60%) chance Saturday night snow level 4,000′. Rain and snow likely (60%) Sunday through Wednesday snow level 4,500′ Sunday falling to 3,500′ Monday (Martin Luther King, Jr. Day) and holding there through Wednesday.

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Here again is my weather quiz question for this week. On average how much pollen is released into the atmosphere in the United States each year? Your answer should be in the number of pounds per year. Please place your answer as a comment at the bottom of this page. 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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