NEW YORK (REUTERS) - A winter storm marched up the US East Coast on Wednesday (Dec 16), delivering a disruptive blow to transportation systems and a welcome day off for some school kids, but not for many who have been learning remotely during the pandemic. By mid-afternoon, the Nor'easter had brought a wintry mix to Washington and wind-whipped snow to New York City, parts of Maryland, Virginia, West Virginia and Pennsylvania as it threatened a swath of the country that is home to more than 50 million people. The sprawling system could dump up to 60cm of snow in an area stretching from eastern Pennsylvania to New York's Catskill Mountains, with less amounts of 30cm or more in the rest of the north-east, forecasters said.