A Winter Storm Warning is in effect for Western Oregon and the Cascades until 10am Tuesday. Anyone above 2,000 feet may see between 2 to 6 inches of fresh snow by the end of Tuesday.
A Winter Weather Advisory is also in effect for Western Oregon until 10am Tuesday. For the advisory, anyone above 1,500 feet may gather between 1 to 2 inches of snow.
Those in the low valleys beneath 1,500 square feet may see ice to form on the roads in the early morning, and a few snowflakes in the air, but no accumulations.
The inland valleys (including the Willamette and Umpqua Valleys) should be in the upper 30s for daytime highs on Tuesday. Rain and snow mix will begin the day as our cold storm blast through the state. Moisture is moving quickly and the region will return to dry weather by 1 or 2 in the afternoon. Once the precipitation stops, skies will clear and temperatures will drop. Tuesday night into Wednesday morning temperatures may only be in the mid to lower 20s for the valley. All around Wednesday—despite being cold—will stay dry. Skies will see some sunshine, but highs will only warm to the lower 50.
On the coast, breezy wind from the north and off and on heavy bands of showers are possible. Rain will slowly wrap up in the afternoon hours. Temperatures will be around the mid 40s on Tuesday and warm a few degrees on Wednesday. Once Tuesday’s rainfall ends and the dry weather will stick around through Wednesday. The next round of rain arrives with a wet—but warmer—storm on Thursday. Highs Thursday will rebound to the mid 50s.
Thursday could be a tricky weather day. The cold air arriving Tuesday and Wednesday will settle to the bottoms of the valleys across Western Oregon. Warmer weather pushes into the state on Thursday. This warm and wet air mass settling above cold air trapped in the valleys is a recipe for freezing rain. As of now, it’s uncertain if freezing rain will occur, but the possibility for some does exist come Thursday.
Updated Monday evening by meteorologist Travis Knudsen on December 5, 2016.
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