Heavy snowfall Wednesday night and Thursday morning covered parts of Montana, Wyoming and western South Dakota.
As of Thursday morning, up to 6-8 inches accumulated on portions of the Black Hills in South Dakota, and Cut Bank and Lewistown in Montana had their first snowfall of the season. The early snowfall has caused over 30,000 power outages in Calgary, Alberta, and threatened to cause power outages in the Rockies and northern Plains of the United States.
AccuWeather Senior Meteorologist Brett Anderson said "Many times when we see an outbreak like this, this early in the season, it doesn't last and will go back to normal pretty quickly."
Heavy snow arrived early due to cold air building in from the Arctic. Residents of the affected areas are more likely to see weather like this in late October and early November.
Rapid City, South Dakota, recorded the earliest measurable snowfall on Sept. 10-11. This broke the previous early season snowfall of Sept. 13, 1970.
A trace of snow fell in North Platte, Nebraska, on Sept. 11, setting the earliest snowfall on record
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