A winter Storm Warning is in effect until midnight with the National Weather Service reporting heavy snowfall over much of the Washington Cascades.

Between 10 to 20 inches are expected to fall in the mountains tonight, creating hazardous conditions for travelers on Interstate 90, where chains or four-wheel drive are required in both directions.

Snoqualmie Pass has been closed multiple times over the past few days as accidents and avalanche-clearing work have jammed up lanes.

Snow storms are forecasted to continue until Friday night, when it could be cold and clear, and some possible sun breaks on Saturday, according to the National Weather Service.

Chains or four-wheel drive are required for vehicles crossing Stevens Pass, while only traction tires are required on White Pass.

The highway which runs through White Pass, U.S. 12, was damaged by mudslides earlier this month. It has since been reopened, with a section of the pass reduced to single lane travel and directed by a traffic light.