Massive, days-long winter storm starts hitting large swaths of U.S.

States in the Northern Plains were largely shutting down ahead of a massive winter storm that could dump up to 2 feet of snow in some areas, accompanied by strong winds and dangerously cold temperatures. The system stretches as far west as California.

More than 75 million Americans are under winter weather alerts in 29 states, CBS News weather producer David Parkinson says.

Many schools throughout the Dakotas, Minnesota and Wisconsin were called off for Wednesday, ahead of the storm. Offices closed, and so did the Minnesota Legislature, which won't reconvene until Monday. Emergency management leaders warned people to stay off the roads or face potential "whiteout" conditions due to the snow and fierce winds.

Almost 900 U.S. flights had been canceled by Wednesday morning, FlightAware.com said.

The storm will make its way toward the East Coast later in the week. Places that don't get snow may get dangerous amounts of ice. Forecasters expect up to a half-inch of ice in some areas of southern Michigan, northern Illinois and some eastern states.

The snowfall could be historic, even in a region accustomed to heavy snow. As much as 25 inches may pile up, with the heaviest amounts falling across east-central Minnesota and west-central Wisconsin, the National Weather Service said. Wind gusts could reach 50 mph and wind chills are expected to hit minus 50 degrees Fahrenheit in some parts of the Dakotas and Minnesota.

The Minneapolis-St. Paul area could see 2 feet of snow or more for the first time in over 30 years.

Minnesota Gov. Tim Walz declared a peacetime emergency Tuesday and said the states National Guard will be ready to respond to if needed, CBS Minnesota reported. The station said the storm could turn out to be one locals will "talk about for years to come."

Some families scrambled Tuesday to get shopping done before the weather closed in. At a Costco in the Minneapolis suburb of St. Louis Park, Molly Schirmer stocked up on heat-and-serve dinners and Mexican Coca-Colas, knowing that she and her two teenagers might get stuck at home.

"The schools are already preparing to go online, so the kids will probably be home doing online school," Schirmer said of her 13- and 15-year-olds.

At another Costco, in suburban Eagan, Larry and Sue Lick bought toilet paper, kitchen essentials and coffee ahead of the storm. They also rescheduled medical appointments and a family gathering, just to stay off the roads.

"It's not so much our driving, but you've got to worry about everybody else driving, with so many accidents caused by people that don't know the winter driving," said Larry Lick, 77.

The weather service said the blizzard will actually involve two rounds. For the Minneapolis-St. Paul area, the first blast arrives Wednesday afternoon with up to 7 inches of snow. Round 2 is forecast to start later Wednesday and extend into Thursday with the real whopper -- an additional 10 to 20 inches expected.

Temperatures could plunge to minus 15 to minus 20 degrees Fahrenheit Thursday and to minus 25 degrees Fahrenheit Friday in Grand Forks, North Dakota. Wind chills may fall to minus 50 degrees Fahrenheit, said Nathan Rick, a meteorologist in Grand Forks.

Wind gusts of 35 mph will be common in western and central Minnesota, with some reaching 50 mph. That will result in "significant blowing and drifting snow with whiteout conditions in open areas," the weather service said.

According to the weather service, the biggest snow event on record in the Twin Cities was 28.4 inches from Oct. 31 through Nov. 3, 1991 — known as the Halloween Blizzard. The second-largest was 21.1 inches of snow from Nov. 29 through Dec. 1, 1985. The Twin Cities got 20 inches of snow on Jan. 22 and Jan. 23, 1982.

Hardware store owners said residents were generally taking the forecast in stride.

At C&S Supply, an employee-owned hardware store in Mankato, manager Corey Kapaun said demand was high for salt and grit, but not for shovels, snow blowers or other equipment. He attributed that to the fact that winter is two-thirds over.

Kapaun said he's sold 130 to 140 snow blowers and around 1,000 shovels this winter, when Mankato has seen more than 3 feet of snow.

"I think people are either prepared or they're not," Kapaun said. "It's usually the first snowfall of the year that gets a lot of attention. With a storm like this, I expected a little bit more, but we've already had a big year of snow already."

In Sioux Falls, Dallas VandenBos has owned Robson True Value hardware store for 48 years. His customers are used to the snow, but don't necessarily trust the forecast.

"When we had that storm the first part of January, they told us we were probably going to get 3 or 4 inches of snow, and we got 18 inches," VandenBos said.

Sales of snow-related items haven't really picked up, but VandenBos has a backlog of snow blowers to repair. Those bringing them in Tuesday were out of luck — they won't be ready for a week.

"They're not going to get them in time for this snow," VandenBos said.

Forecasters at AccuWeather said the same storm system could result in icing across a 1,300-mile band from near Omaha, Nebraska, to New Hampshire on Wednesday and Thursday, creating potential travel hazards in or near cities such as Milwaukee, Detroit, Chicago and Boston.

The storm system isn't sparing California, where the latest in a series of winter storms bringing the potential for rain, snow and hail for much of the state.

A "major snow event" was possible in foothills and mountains near Los Angeles, with several inches predicted even for elevations as low as 1,000 feet, the National Weather Service said.

CBS Los Angeles reports that the service issued a rare blizzard warning for Ventura and Los Angeles County mountain ranges, with "heavy snow with winds gusting up to 75 mph and near zero visibility" expected.

This storm, which will last for multiple days, stands to be a "major disruption-type event for millions of Southern California residents," according to the station's forecasters.

More than 125,000 California homes and businesses had already lost power Wednesday morning, according to PowerOutage.us.

Daytime temperatures in Southern California were unlikely to get out of the low to mid-50s and potentially damaging winds reaching 50 mph were predicted along the central coast, with gusts of 70 mph possible in mountains.

As the northern U.S. deals with a winter blast, record warmth is expected in the mid-Atlantic and Southeast — 30 degrees to 40 degrees above normal in some places. Record highs are expected from Baltimore to New Orleans and in much of Florida, Pereira said.

Washington, D.C., could hit 80 degrees on Thursday, which would top the record of 78 degrees set in 1874.

In:
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• Minnesota
• California
• Minneapolis

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