A major winter storm is currently impacting the Cascades and Rockies, with Winter Storm Warnings in effect until Thursday afternoon. Heavy snow is expected to continue hammering the Washington and Oregon Cascades, spreading into Idaho and western Montana. Accumulations of one to four feet are possible in higher terrain, with strong winds creating whiteout conditions. Snowfall rates may exceed an inch per hour, making mountain passes hazardous and travel disruptions likely through Thursday. Road closures and power impacts remain possible across exposed areas.