A unusual winter storm is moving through the northern Rockies this weekend.
Forecasts predict up to 16 inches of whiteout 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 higher ground in the region.
In the eastern United States, officials are examining preparedness measures 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 prompted transport alerts and safety steps in the affected states.