The US northeast has been battered by heavy snow and strong winds as a mighty storm carved a violent arc across several states, killing more than a dozen people and snarling holiday travel.
More than 3000 flights have been cancelled since Christmas Day including 746 on Thursday, as the storm wreaked havoc from the Gulf of Mexico to the Great Lakes before heading northeast, according to tracker FlightAware.
In New York City, high winds caused major air traffic delays: 186 flights were cancelled outright at the three major airports - Kennedy, LaGuardia and Newark.
"Winter weather has arrived for many parts of the state, so as a precaution we have opened the emergency operation centre to co-ordinate response efforts using all state and local resources," New York governor Andrew Cuomo said.
New York Mayor Michael Bloomberg used residents still without power two months after deadly superstorm Sandy slammed into the city in October to seek refuge in emergency shelters.