Seattle, Washington – Snow will begin piling up across the Cascade passes after 8 p.m. Sunday, setting up hazardous travel before daybreak Monday. Mountain highways including Interstate 90 at Snoqualmie Pass and U.S. 2 at Stevens Pass could turn snow-covered overnight, with reduced visibility during heavier bursts.
According to the National Weather Service in Seattle, a Winter Weather Advisory is in effect from 8 p.m. Sunday until 1 p.m. Monday for the Cascades of Whatcom, Skagit, Snohomish, King, Pierce and Lewis counties. Snow totals of 5 to 10 inches are expected near Mount Baker and Stevens Pass, while 8 to 12 inches could fall near Snoqualmie Pass, Crystal Mountain and White Pass.
Across western Washington, the heaviest accumulation is likely late Sunday night into Monday morning, directly impacting the Monday commute through mountain corridors. SR 18 at Tiger Mountain Summit and routes near Paradise and Longmire on Mount Rainier may become difficult to navigate as snow intensifies.
Drivers should slow down, allow extra travel time and prepare for chain requirements or temporary closures. Officials also advise preparing for isolated power outages in higher elevations.
Snow will taper by early Monday afternoon, but slick conditions may persist at pass level beyond 1 p.m. Additional advisories are possible if snowfall rates increase overnight.
