BILLINGS, Mont. — The Latest on a major storm system expected to hit the Rockies over the holiday weekend (all times local):

5 p.m.

A major winter storm has started sweeping through the U.S. Rocky Mountains, with heavy mountain snows and bitter cold temperatures forecast through the long Presidents Day weekend.

The National Weather Service says the Arctic front will sweep south from Canada, hitting Idaho and Montana first then Wyoming, Utah and Colorado by Sunday and Monday.

Warnings of potential blizzard conditions were issued on Saturday in western Montana, where up to two feet of snow was expected along with damaging winds up to 50 miles per hour.

In Wyoming, a skier was killed after triggering an avalanche near Jackson. Avalanche advisories were posted across the region.

Temperatures were expected to plummet by Sunday night on the Northern Plains, ushering in several days of frigid conditions.

9 a.m.

An Arctic cold front is forecast to sweep through the Rocky Mountains with heavy mountain snows over Presidents Day weekend, while cold temperatures descend on the Northern Plains.

The winter blast was expected to hit northern Idaho and Montana Saturday, with damaging wind gusts that could reach 50 miles per hour.

The National Weather Service says the storm system will then sweep south into Wyoming and Colorado on Sunday and Monday.

A winter storm warning was in effect for northwest Montana and northern Idaho. Blizzard conditions were forecast along Interstate 90 east of Missoula, Montana.

Temperatures were expected to plummet below zero across the Northern Plains by Sunday night.

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