Forecasters say mountain travel and high-country recreation could be hazardous as snow, wind and changing temperatures move through the region.

A long-track supercell battered South Dakota, Minnesota and northern Nebraska with destructive winds, power outages and a confirmed tornado.

Winter storm warnings and advisories stretch from Wyoming to the Pacific Northwest, with blowing snow and dangerous travel conditions expected into Monday.

Forecasters say storms could bring strong wind, lightning and large hail after a very warm day in North Idaho.

Meteorologists say tornadoes are possible in Montana and stress the need for shelter plans, alerts and travel awareness.

Forecasters say slow-moving storms could bring heavy rain, while eastern Montana faces dangerous heat and rough water near Fort Peck Lake.