* WHAT...Snow expected above 3500 feet. Total snow accumulations 4 to 9 inches Williams Creek Summit and Lost Trail Pass...2 to 4 inches Lemhi Pass and Bannock Pass...1 to 3 inches Gilmore.
* WHERE...Williams Creek Summit, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, Leesburg, and Bannock Pass.
* WHEN...From 11 PM Monday to 11 PM MST Tuesday.
* IMPACTS...Travel could be very difficult at passes and backcountry Forest Service roads. The hazardous conditions will impact the Tuesday morning and evening commutes.