Winter has returned to parts of the American West just days after summer officially began. Forecasters have issued rare June winter storm warnings across parts of Montana, Idaho and Wyoming as an unusually cold weather system threatens heavy snowfall, freezing temperatures and hazardous travel during one of the busiest holiday travel periods of the year.
The slow-moving storm has delivered a dramatic reversal after days of scorching heat across the northern Rockies. Temperatures have plunged by as much as 30 degrees, replacing summer sunshine with conditions more typical of late autumn or even midwinter.
