Jon Gilbert, of the Portsmouth, N.H. water department, steams a frozen hydrant in Portsmouth, N.H., Wednesday, Jan. 23, 2013. Temperatures in New Hampshire hovered close to single digits, with wind chill temperatures going below zero for most of the day. (AP Photo/Charles Krupa) (The Associated Press)
Anthony Cavallo, right, and his wife Jeanne Cavallo use hay to insulate their trailer in preparation for a cold night, Wednesday, Jan. 23, 2013, in Union Beach, N.J. The Cavallo's had to buy the trailer out of pocket and place it next to their home damaged by Superstorm Sandy because they've yet to receive storm aid. Cold weather is bringing extra worries to residents of the areas hit by Sandy. The deep freeze will continue into Thursday and Friday. There's a chance of snow Friday afternoon and evening, but accumulations are expected to be minor. (AP Photo/Julio Cortez) (The Associated Press)
South Boston residents who did not wish to be identified walk their dogs at Castle Island in Boston, Wednesday, Jan. 23, 2013. The National Weather Service says it's not expected to get above 17 degrees in Boston, with the wind chill making it feel five below. (AP Photo/Michael Dwyer) (The Associated Press)
Steam rises from a pedestrian on Wednesday, Jan. 23, 2013 in Barre, Vt. The National Weather Service said states from Ohio through to the far northeast of Maine could expect to be slammed by an Arctic blast on Wednesday.(AP Photo/Toby Talbot) (The Associated Press)
A man walks by a shop on Main St. in freezing temperatures on Wednesday, Jan. 23, 2013 in Montpelier, Vt. Sub-zero low temperatures are forecast for the area. (AP Photo/Toby Talbot) (The Associated Press)
NEW YORK – Polar air has settled in earnest over the Northeast, grinding trains to a halt, bursting pipes and bringing further misery to families still trying to recover from Superstorm Sandy.
The frigid air mass trekked from the Midwest into the region on Wednesday, prompting the National Weather Service to issue wind chill warnings across upstate New York and northern New England.
In a damaged neighborhood near the beach on New York City's Staten Island, people who haven't had heat since the late October storm are taking refuge in tents set up by aid workers.
Eddie Saman is sleeping in a tent because the gaping hole in the roof of his home has rendered it uninhabitable — and unheatable.
The coldest weather is expected to continue into Thursday.