Nation ‘Historic’ September blizzard, bitter cold to wallop northern Rockies this weekend September 25, 2019Doyle Rice, USA TODAYComments Off on ‘Historic’ September blizzard, bitter cold to wallop northern Rockies this weekend Heavy snow – up to 3 feet in some areas – and temperatures in the 20s and 30s will bring an early taste of winter to Montana, Idaho and Wyoming.