The upper airflow (look at the little arrows along the coast) is curving from the southwest bringing warmer more moist air into Oregon. A frontal system will push into northern reaches of our area (see last frame of animation). It will bring a chance of precipitation to us.  A series of fronts will then bring in subtropical moisture and it will be warmer again and continuing the chances for rain.

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Advisories: A WINTER STORM WATCH IS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING FOR THE NORTHERN PART OF THE NORTH CASCADES 10″-14″ OF SNOW POSSIBLE MONDAY NIGHT.

There are no other advisories for Western Oregon.

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For the Willamette Valley: Mostly cloudy with a  (30%) chance of showers tonight lows 30-32. Mostly cloudy with a slight (20%) chance of rain Monday morning then a (30%) chance in the afternoon high 43-46. Rain Monday night through Wednesday lows 40-45 highs warming to the low 50s. Rain will be likely (60%) Wednesday night low 39-42. There will be a (40%) chance of rain Thursday high near 50. Thursday night through Saturday there will be a good (40-50% chance) with lows in the mid to upper 30s and highs in the upper 40s.

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For the Umpqua Basin:  There will be a (40%) chance of rain and snow showers at this evening and a slight (20%) chance of showers (rain) overnight with patchy fog, snow level 2,500′ falling to 2,000′ late low 33-35.There will be a slight (20%) chance of showers Monday morning with fog, then a good (50%) chance of rain in the afternoon snow level rising to 3,500′ high in the low to mid 40s. Rain Monday night through Wednesday lows in the low to mid 40s  highs in the upper 40s to near 50. Rain will be likely (60%) low in the low 40s Wednesday night. Cloudy with a (40-50%) chance of rain Thursday through Sunday highs in the mid 40s to near 50 lows in the mid 30s to 40.

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Forecast for the South Coast:  For  tonight a (30%) chance of  showers with some fog inland low near 34-37. A slight(20%) chance of AM showers, then rain likely (60%) Monday afternoon high 48-50. Rain Monday night through Wednesday, windy Monday night and Tuesday and breezy Tuesday and Wednesday lows 45 highs near 50. Rain likely Wednesday night , a (40%) chance of rain Thursday, and a slight chance (20%) Thursday night and Friday lows 40-45 highs again near 50. There will be a (50-60%) chance of rain Friday night, Saturday and Sunday with rain likely (60%) Saturday night lows in the low 40s highs in the low 50s.

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For the Cascades of Lane County: There is a (30%) chance of snow showers tonight and Monday morning then a (40%) snow level 2,500′. Rain and snow (80%) Monday night the snow level rising from  3,500′-4,000′ with 5-9″ of snow.  Rain and snow Tuesday and breezy snow level will be 5,500′,’Tuesday night rain and snow, snow level 5,000′, Wednesday rain snow level 7,000‘. Rain and snow likely Wednesday night snow level 5,o00‘. Chance of rain and snow Thursday snow level 4,500′. Friday through Sunday rain with snow levels staying well above the passes.