Less than a week after the autumnal equinox ended summer in the United States, the northwestern parts of the country got hammered by an early winter storm.
Parts of Montana received more than 90 centimeters of snow.
Snow blanketed parts of California, Oregon, Washington, Montana, Idaho, Nevada and Utah Sunday.
Calling the the storm "historic", the National Weather Service said, "many daily record low maximum temperature records are possible through Monday, especially across the Northern Great Basin, Rockies and Northern California."
Montana Governor Steve Bullock declared an emergency Sunday, allowing the state to free up resources to help the worst-affected areas.
"Montanans should heed all warnings from state and local officials, travel safely, and be cautious during this time," Bullock said in a statement.
"Very heavy wet snow and strong winds will lead to downed trees, power outages, and treacherous travel conditions," the weather service warned.
It also warned Montanans to take extra care of their pets and livestock.
The storm was expected to let up sometime Monday.