From Portland National Weather Service:
Another winter storm expected Tuesday with low snow levels through Thursday and significant snowfall in the mountains. Another strong but cold storm system will impact SW Washington later Tuesday and especially Tuesday night through Thursday. This storm will bring another significant snowfall to the Cascades, the Cascade Foothills and the Coastal Mountains.
Snow levels with this system will also be very low. Snow levels will be around 500 to 1000 feet across SW Washington and will remain in that range through Wednesday and Thursday. Heavier showers could lower the snow level at times to the valley floor.
At this time, snow amounts at lower elevations are uncertain. Several inches are possible in the hills around the area Tuesday afternoon through Thursday. Be sure to continue to check the latest forecasts and statements concerning new developments on this winter weather event.