A unusual winter storm is moving through the northern Rockies this weekend.
Forecasts call for up to 16 inches of snow in the mountains of Idaho and Montana.
Record cold is expected, and precipitation is probable across Wyoming and lower elevations.
Winter Storm Warnings have been issued for elevated terrain in the region.
In the eastern United States, officials are reviewing 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 travel cautions and preparation measures in the affected states.