From the National Weather Service:
A cold front will bring snow to the Cascade Foothills and Coast Range Wednesday evening through Thursday morning. A strong cold front will move across the regional Wednesday morning with snow levels dramatically lowering Wednesday afternoon and evening. Snow levels will lower to 3000 feet Wednesday afternoon and then down to 2000 feet Wednesday night.
Precipitation will decrease behind the front Wednesday afternoon but another approaching trough will continue mountain showers with accumulating snow through Thursday morning.
Snow amounts will not be significant, but will likely challenge anyone planning on driving to the coast or across the Cascade Foothills. Expect 1 to 2 inches of snow above 2000 feet from Wednesday evening through Thursday morning.