Strong winds are now affecting much of central Montana and High Wind Warnings are in effect until 11pm.
An upper level storm system moving over the northern Rockies is responsible for the gusty winds being felt throughout the region.
Gusts over 60 mph are already being reported in some locations east of the Continental Divide.
Winds will become sustained at 25-35 mph with occasional gusts near 60 mph in areas along I-15.
Wind speeds should gradually decrease later tonight as the storm system moves farther east.
Heavy snow is also a concern for those heading over the Rocky Mountains.
Winter Weather Advisories are in effect for the Rocky Mountain Front and Lewis & Clark County until 11pm.
6-12" of snow is likely at elevations above 5000 feet, with as much as 16" on some mountain peaks.
Below 5000 feet, a few snow showers are possible, but significant accumulation is unlikely.