UPDATE 2-Winter storm knocks out power to 380,000 in U.S. Southeast

A powerful winter storm that hit the U.S. Southeast over the weekend knocked out power for more than 380,000 customers and forced the cancellation of hundreds of flights on Sunday. Authorities urged residents to stay off the roads as snow, sleet, and freezing rain were expected to continue through Sunday night and into Monday morning, the National Weather Service said.