The National Weather Service has issued a winter storm warning for the northern and central Washington Cascades where 1-to-3 feet of snow are possible by Friday afternoon.
Forecasters say the freezing level will drop to 2,500 feet by Friday morning, making hazardous driving conditions in the mountain passes.
Because of heavy rain in parts of Western Washington, forecasters also have issued a flood warning for the Skokomish River, on the southeast side of the Olympics.
The National Weather Service says the snow will extend to the east slopes of the Cascades and northeast Washington. Snow and rain may be mixed in other parts of Eastern Washington with pockets of freezing rain possible over the Columbia Basin.