* WHAT...Heavy snow expected. Total snow accumulations between 8 and 18 inches with the highest elevations receiving over two feet. Wind gusts as high as 35 mph.

* WHERE...Big Lost Highlands/Copper Basin, Sawtooth/Stanley Basin, Sun Valley Region, Wood River Foothills, Big Hole Mountains, Centennial Mountains - Island Park, Teton Valley, Bear River Range, Blackfoot Mountains, Caribou Range, Franklin/Eastern Oneida Region, Marsh and Arbon Highlands, Raft River Region, and Southern Hills/Albion Mountains.

* WHEN...Until 5 PM MST Friday.

* IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning and evening commutes.