* WHAT...Heavy snow expected. Total snow accumulations between 2 and 6 inches at pass level, with snow amounts in excess of a foot in the higher terrain.
* WHERE...Northwest Beaverhead County.
* WHEN...From 6 PM this evening to noon MDT Monday.
* IMPACTS...Travel could be difficult over passes. Back country conditions will be very dangerous, especially near and above pass level.
* ADDITIONAL DETAILS...Wet snow may down trees and block access to forest roadways.