The storm is expected to dump more than a foot of snow on parts of Colorado and
southern Utah by midday Wednesday and blow east into the Plains states through Christmas Day. Blizzard warnings were likely on Christmas Eve in Kansas.
"Pretty much the entire central and southern Rockies are going to get snow, and then it's going east and will drop more snow," said Stan Rose, a National Weather Service meteorologist in Pueblo, Colo.
South Dakota Gov. Mike Rounds declared a state of emergency Tuesday. The National Weather Service in Sioux Falls, S.D., warned of treacherous travel conditions from Wednesday through Friday night, calling the storm "life-threatening."
The Nebraska State Patrol urged drivers Wednesday morning to use extreme caution when venturing out on the roads across the central third of the state because the roads are slick as freezing rain and snow had started to fall.
A day earlier a Colorado woman was killed when her SUV apparently hit black ice and slid across a median in western Nebraska.
In Nevada, multiple wrecks were reported in and around Reno as snow blanketed the area shortly before the Tuesday evening commute. No serious injuries were reported, the Reno Gazette-Journal newspaper reported.
Blustery weather had already snarled traffic in Arizona, with blizzard-like conditions shutting down roads and causing a pileup involving 20 vehicles Tuesday. South of Phoenix, a dust storm set off a series of collisions that killed at least three people.
A tropical jet stream pumping in moisture from the storm's south was likely to cause plenty of snow as the storm headed into the Plains states.
A winter storm watch was in effect for most of southeast Colorado, the panhandle of Oklahoma and north Texas through Thursday. By Tuesday afternoon, light snow was falling in Salt Lake City. No major airport delays were reported there or in Denver, but holiday travelers across the region were warned to check with their airlines before arriving for flights.
Elsewhere, holiday travelers scrambled to adjust their plans before the snow storm hit.
In Denver, Sarah McAnarney and her husband planned to leave town Wednesday to visit family in Ozark, Mo., with their springer spaniel, Olive. But forecasts prompted them to skip a day of skiing in the Rockies and start driving a day early.
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