The advisory calls for caution as snow accumulates in higher elevations, affecting commutes and freight movement. Cold air converges with heavy clouds, bringing disruptive snowfall before plans can adjust.
Roads are expected to glaze quickly, reducing visibility and slowing traffic. Travelers are urged to build extra time into schedules, drive carefully, and keep winter gear close. Power interruptions may occur, but early preparation can lessen disruptions.
Forecasters have issued an updated Winter Weather Advisory for the Cascades of Whatcom and Skagit Counties, along with Western Okanogan County. Along the Cascade Crest and the highest points of Highway 20, snowfall is expected to begin around 4 p.m. on Wednesday.
The most difficult travel conditions are forecast from Wednesday evening through Thursday morning, with another round possible Thursday night. Near the crest and Washington Pass, rapid shifts in conditions are likely, demanding careful planning and traction readiness.
Residents above 4,000 feet should expect heavy snow accumulation, while lower valleys may experience slush, black ice, and slower snow removal during rush hours.
“Travel could be very difficult to impossible in spots,” the advisory warns.
Before departing, travelers should review the latest forecasts, road cameras, and pass reports. When plans are flexible, delaying travel remains the safest choice.
This alert highlights hazardous snow conditions across Washington’s Cascades, urging patience, preparation, and safe travel habits during peak storm hours.