Rain and snow through Tuesday morning By: Mike Heard and last updated 2021-04-05 15:45:40-04 BOZEMAN â Finally, cooler temperatures and widespread rain and snow impacting SW Montana to begin the new work week. Upper-level Low will slowly spin into central Wyoming Monday evening and Tuesday morning. This storm will impact the southern half of Montana tonight into Tuesday morning. Mountains will see wet heavy snow above 6,000â. Most mountain passes should see wet roads or even areas of slush turning icy by Tuesday morning. This storm should rapidly push out of the region by Tuesday afternoon with a break between disturbances on Wednesday.