A winter storm warning is in effect until Wednesday morning in the Washington Cascade passes, where 1 to 2 feet of new snow are expected by Tuesday night.
The Transportation Department closed Interstate 90 at the summit of Snoqualmie Pass in both directions for about four hours Tuesday morning for avalanche control. It reopened around noon, but eastbound lanes were closed again shortly afterward due to multiple spinouts.
Restrictions, delays and highway closures are also possible on Stevens and White passes.
In the lowlands, the National Weather Service has issued flood warnings Tuesday for Chehalis River near Grand Mound in Thurston County and Porter in Grays Harbor County. Also for the Skookumchuck River near Bucoda in Lewis and Thurston counties, and the Skokomish River near Potlatch in Mason County.
Because of heavy rains in Western Washington, forecasters also are watching for flooding on other rivers in Grays Harbor, Lewis, Mason and Thurston counties.
On the south Washington coast, a high wind warning is in effect from 6 a.m. to 4 p.m. Tuesday. Forecasters expect winds near headlands and beaches to be between 35 and 45 mph with gusts to 70 mph. Coastal communities can expect gusts up to 60 mph.
The strongest winds are expected late Tuesday morning through the early afternoon.
Forecasters say Tuesday's storm will be followed by another vigorous frontal system on Wednesday night and Thursday.
The weather should turn drier Friday with a chance of partly sunny days over the weekend.