Mount Washington records wind chills of -104F - the lowest temperature EVER ... trends now

A powerful arctic blast swept into the Northeastern U.S.  on Friday, pushing temperatures to a record low - with New Hampshire's Mount Washington recording a wind chill of -104 degrees Fahrenheit (-75 Celsius).

A National Weather Service (NWS) advisory said the mass of frigid air would keep temperatures at life-endangering levels through Saturday, warning of 'extremely dangerous' conditions from the 'short-lived blast.'

Boston and Worcester, the two largest cities in New England, were among the school districts closed on Friday over concerns about the risk of hypothermia and frostbite as children waited for buses or walked to school.

Boston Mayor Michelle Wu declared a state of emergency through Sunday and opened warming centers to help the city's more than 650,000 residents cope with what the NWS has warned could shape up to be a 'once-in-a-generation' cold front.

The bitter cold forecast forced a rare closing of a floating museum that presents a daily re-enactment of the 1773 Boston Tea Party, when a band of colonists disguised as Native Americans tossed crates of tea taxed by the king into the harbor. 'It's too cold for that, we're closed,' a receptionist at the museum said on Friday.

Early on Friday, the core of the cold air mass, driven from Arctic Canada into the United States by high-altitude air currents, was centered over the U.S. Plains, said weather service forecaster Bob Oravec. International Falls, Minnesota, was the coldest spot as of 7 a.m., with temperatures hovering around -36 F (-38 C). Dry air meant snowfall would be limited, he said.

'It's moving into the Northeast' and temperatures will drop throughout the day on Friday, he said. 'That's

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