A powerful winter storm system pounded the nation’s midsection Wednesday and headed toward the Northeast, where people braced for the high winds and heavy snow that disrupted holiday travel, knocked out power to thousands of homes and were blamed in at least six deaths.

Hundreds of flights were canceled or delayed, scores of motorists got stuck on icy roads or slid into drifts, and blizzard warnings were issued amid snowy gusts of 30 mph that blanketed roads and windshields, at times causing whiteout conditions.

“The way I’ve been describing it is as a low-end blizzard, but that’s sort of like saying a small Tyrannosaurus rex,” said John Kwiatkowski, a meteorologist with the National Weather Service in Indianapolis.