High temperatures 15-20 degrees above normal in Idaho Wednesday. Temperatures will top out near 100 degrees in the Treasure Valley and Magic Valley. Even mid 90s as far north as Lewiston. Snow at the high elevations is causing some flooding especially on the Boise River. This hot weather will not last much longer as huge cold low pressure will take over later this week into the weekend.
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.