A rare winter storm is sweeping through the northern Rockies this weekend.
Forecasts project up to 16 inches of whiteout in the mountains of Idaho and Montana.
Extreme chill is forecast, 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 assessing response plans after earlier winter events, including a recent report on the Nashville storm that identified flaws and recommended changes.
The active warnings and cold spell have led to road advisories and readiness actions in the affected states.