A winter storm watch has been issued for the low lands of western Washington and the valley floors of western Oregon, including Seattle and Portland.
There is potential for a major snow event with several inches of accumulation starting late Tuesday and into the day on Wednesday.
Warmer air will work into the region and change things back to rain across the lower elevations by the weekend.
If you have travel plans to the Pacific Northwest over the next two weeks, pack for wet weather. One forecast model is giving Seattle 6 inches of water, with either rain or snow falling just about each day between now and the end of the month.