An unseasonably cold low pressure system is expected to bring below-average temperatures to the northern Rockies through early week. Temperatures will be up to 35 degrees below average in some locations this weekend.

In fact, low temperatures will drop below freezing in the higher elevations, leading to the chance for the first snow of the season to fall. In West Glacier, Montana, the average date for the first temperature below 32 degrees is Sept. 13, so the cold conditions are about three weeks ahead of schedule.

Snow accumulations will generally be a few inches or less, and the snow is expected to melt quickly. Up to 8 inches of snow is possible on the highest peaks through Sunday.

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