The upper airflow(look at the little arrows in the shaded area off the coast) is curving from the southwest continuing to bring warm moist air into Oregon. It’s called the “Pineapple Express” because the airflow is actually coming from Hawaii. Here’s the next frontal system to bring more rain. Another one will move in between Sunday and Monday.

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For the Central & Southern Willamette Valley: Light rain (60%) likely this evening and a good (50%) chance at night high 50 low near 40. Rain likely (60%) Saturday (patchy AM fog, high in the upper 40s. Rain will be likely Saturday night through Monday highs near 50 lows near 40. Mostly cloudy with showers likely Monday night low in the upper 30s. A good (50%) chance of showers Tuesday high 42-45. Partly cloudy Tuesday night through Thursday with decreasing chances of showers from 40% Tuesday night to 20% Thursday high mid 40s low in low 30s. Partly cloudy Christmas Day with a (30%) chance of showers high near 50.

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For the Umpqua Basin: A chance (40%) of rain this evening and  it will be likely  (60%) late with patchy fog late tonight low in the  low to mid 40s. Patchy AM and late night fog with rain likely (60%) Saturday turning and a good (50%) chance Saturday night high mid 50s low in low to mid 40s. Rain Sunday, Sunday night, changing to showers Monday, and Monday night mostly cloudy highs near 50  lows in upper 30s to low 40s. Chance of rain and snow showers  (60%) Tuesday  high 44-47. There will be a slight (20%) chance of showers Tuesday night then partly cloudy with patchy AM fog Wednesday and a slight (20-30%) Wednesday through Thursday low in mid to upper 30s  high in mid to upper 40s. Mostly cloudy Christmas Day with a (20%) slight chance of rain high 43-46.

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Forecast for the South Coast: Tonight cloudy  rain this evening, likely (60% )with patchy fog late tonight low near 45. Saturday rain likely (70%) and a good (50%) chance Saturday evening and rain late at night  with late night and early morning fog high near 49-52 low in the upper 40s. Rain Sunday and Sunday night, Showers and breezy Monday, and likely (60%)Monday night highs in the low to mid 50s lows in the low 40s. Chance of showers Tuesday (50%) then a slight (20%) chance  Tuesday night high in the upper 40s low in upper 30s. Partly cloudy Wednesday high 50. Partly cloudy with a slight (20%) chance of showers Wednesday night through Thursday night highs near 50 lows near 40. A slight (20%) chance of showers Christmas Day high 50.

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For the Cascades of Lane County: Tonight snow level rising to 7,000? with scattered showers. Rain likely (60%) Saturday with rain Saturday night snow level 7,000?. Rain Sunday snow level 6,500?, likely (60%) at night snow level 5,000?. Rain likely Monday snow level 4,000?. Rain and snow showers likely Monday night snow level falling to 3,000?. Snow showers likely Tuesday snow level 2,500?with a chance of rain and snow showers at night snow level 3,000? . Wednesday and Wednesday night partly cloudy slight (20%) chance of rain and snow showers, snow level 3,500? rising to 4,000? by Wednesday night. Thursday, Thursday night , and Christmas Day partly cloudy with a slight (20%) chance of showers snow level 5,500′ Thursday, 6,000′ Thursday night, and 5,500′ Christmas Day.