Winter will make a final appearance in the West the next few days a cool moist weather system moves in. This could surprise some travelers on I-80, I-15, and I-84 from Nevada to Colorado and Wyoming. Travelers to Yellowstone too may find 8 inches or more of snow. Snow in May is by no means unprecedented, but snow possibly down to some valley floors is certainly unusual. Salt Lake City, Idaho Falls, Elko, and Laramie all stand a good chance of seeing accumulations.