* WHAT...Heavy snow possible. Total snow accumulations between 8 and 16 inches with the highest elevations expected to receive closer to two feet.

* WHERE...Big Lost Highlands/Copper Basin, Frank Church Wilderness, Lost River Range, Sawtooth/Stanley Basin, Sun Valley Region, and Wood River Foothills.

* WHEN...From late tonight through Friday afternoon.

* IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning and evening commutes.