Snow should start to fall tonight and continue through Thursday with 6 to 10 inches possible in the higher elevations, and just a couple inches for the valleys. Details here:

Winter Storm Watch in effect for Southwest Montana (Photo Michelle Wolfe/KMMS)

A Winter Storm Watch remains in effect from late Wednesday night
through Thursday evening.

Timing and main impact: snow will increase late Wednesday night
and continue through Thursday before diminishing Thursday night.
Snow levels of 5000 to 7000 feet on Wednesday night will drop to
the Lower Valley elevations by Thursday morning. Poor visibilities
associated with the snow will affect travel as well as slushy
and icy roads.

Snow accumulations: accumulations will range from 1 to 3 inches
for the lower valleys to 3 to 6 inches between 5000 and 7000
feet elevation and 6 to 10 inches above 7000 feet.

Visibility: visibilities will be below one-half mile at times.

Other impacts: those not dressed properly will be at risk for
hypothermia due to the cold wet snow.

Locations affected include: White Sulphur Springs... Battle
Ridge Pass... Bozeman... Bozeman Pass... Targhee Pass... West
Yellowstone... Boulder... Boulder Hill... Elk Park Pass...
Homestake pass... Whitehall... Big Hole Pass... Chief Joseph
Pass... Dillon... Monida Pass... Townsend... Ennis... Norris
Hill... Raynolds Pass... Twin Bridges.