A winter storm brought a snowy, icy mess from Georgia to Maine on Monday, snarling air and road travel and threatening power outages across the region.
In the Deep South, heavy rain could lead to flash flooding.
More than 725 flights had been canceled nationwide as of 11 a.m. ET, with the heaviest disruptions so far coming in the mid-Atlantic and Northeast, according to flight-tracking service FlightAware.
Raleigh, Charlotte and Washington, D.C., saw the most cancellations, AccuWeather said.
Roads were also closed in North Carolina, the Weather Channel said, where travel was slow and dangerous.
Overall, the weather could have less of an impact because schools and many workplaces will be closed for the federal holiday, and traffic should be lighter than usual, according to the Associated Press.
The most disruptive and dangerous aspect of the storm will be from ice and freezing rain, according to AccuWeather. A vast area from the southern Appalachians to the Northeast could see ice accumulations of 0.01 to 0.25 inch, the National Weather Service warned.
Cities such as Charlotte, Asheville, N.C., Roanoke, Va., and Albany, N.Y., could all see significant icing. Enough ice could build up to cause widespread power outages in some communities, AccuWeather warned.
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SOURCE: USA Today, Doyle Rice