Annapolis, Maryland — The next round of bitter cold was set to envelop the southern U.S. on Tuesday, after the first significant winter storm of the year blasted a huge swath of the country with ice, snow and wind. The immense storm system brought disruption even to areas of the country that usually escape winter’s wrath, downing trees in some Southern states, threatening a freeze in Florida and causing people in Dallas to dip deep into their wardrobes for hats and gloves. By early Tuesday, wind chill temperatures could dip as low as minus 10.5 C from Texas across the