A unusual winter storm is sweeping through the northern Rockies this weekend.
Forecasts predict up to 16 inches of snowfall in the mountains of Idaho and Montana.
Extreme chill is forecast, and wet conditions are possible across Wyoming and lower elevations.
Winter Storm Warnings have been issued for higher ground in the region.
In the eastern United States, officials are examining response plans after earlier winter events, including a recent report on the Nashville storm that spotted issues and advised revisions.
The active warnings and cold spell have prompted road advisories and readiness actions in the affected states.