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MADISON, Wis. - Some schools remain closed and utility crews are working to restore power to thousands of customers as parts of Wisconsin dig out of 20 inches of snow.

We Energies and Alliant Energy are dealing with about 30,000 customers that have lost service in the windy winter storm. Some schools canceled classes for a second day because drifting snow is making travel dangerous. Students in Madison, Whitewater, Wisconsin Dells, Waupun, Portage and Platteville school districts are among those on extended holiday vacation.

The National Weather Service says 12 to 20 inches of snow fell in Dane County before tapering off. Authorities say blowing and drifting snow is making some roads impassable, mainly in south central Wisconsin.

As the season's first widespread snowstorm moves on, holiday travelers hope that means they can, too.

The storm is rumbling across the Great Lakes after dumping more than a foot of snow in parts of the Midwest and prompting airlines to cancel more than 1,000 flights.

Two people were killed in a 25-vehicle pileup in Iowa. The storm was also blamed for traffic deaths in Nebraska, Kansas and Wisconsin.

Most of the canceled flights were at Chicago's O'Hare and Midway international airports. Aviation officials said more than 350 flights were canceled at O'Hare and more than 150 at Midway, and the cancellations sent a domino effect across the nation's air traffic grid.

Southwest Airlines was anticipating normal operations Friday morning in Chicago. United Airlines also planned a full schedule, though both airlines cautioned travelers to check their flight status before heading to the airport.

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