A unexpected winter storm is sweeping 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 wet conditions are possible across Wyoming and lower elevations.
Winter Storm Warnings remain active for mountainous areas 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 found shortcomings and suggested updates.
The active warnings and cold spell have prompted travel cautions and preparation measures in the affected states.