A powerful blizzard has isolated New York City and hobbled transport networks, threatening to be among the worst on record. Major snowfall of as much as 30 inches is expected across the East Coast in some areas, the National Weather Service said. More than 5,300 flights in, out or within the US were scrapped at the start of the week, according to FlightAware as of 2 a.m. New York time. ABC News Reporter Lionel Moise breaks down the situation on Bloomberg Television. (Source: Bloomberg)