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New York - A life-threatening blizzard barrelled into the US Northeast, affecting up to 20% of Americans by making workers and students housebound, halting thousands of flights an prompting New York to ban cars from roads and halt subway trains.
With memories still fresh of Sandy, a superstorm that ravaged the East Coast in 2012, the governors of six East Coast states declared emergencies, and the snow blast threatened to affect up to 60 million people in nearly a dozen states.
The National Weather Service warned of a "life-threatening blizzard" that could dump as much as 76 cm of snow on parts of the region. It said winds could gust up to 80 kph around New York City.
Retailers ran short of everything from shovels and snowblowers to bread, water and other basic groceries.
"Please stay home," New Jersey governor Chris Christie told residents, ordering all but the most essential government workers in his state home from Monday afternoon until Wednesday at the earliest.
New York governor Andrew Cuomo banned travel from 04:00 GMT for all but emergency vehicles on roads in 13 counties, including New York City, suburban Westchester and Long Island, with the threat of a $300 fine for violators.
"If you are in your car and you are on any road, town, village, city, it doesn't matter, after 11 o'clock, you will technically be committing a crime," Cuomo said. "It could be a matter of life and death so caution is required."
'Snowmageddon' on social media
Stuck at home, many Easterners turned to social media to give voice to their frustration, adopting such storm-related hashtags as #blizzardof2015, #Snowmageddon2015 and #Snowpocalypse.
"Across NE, millions are panicked they may lose internet and have to talk to their families. Trying hard to remember names. #Snowmageddon2015," tweeted Stuart Stevens, who goes by the Twitter handle @stuartpstevens.
Stock exchanges including Intercontinental Exchange's New York Stock Exchange unit, Nasdaq OMX Group, and BATS Global Markets said they expected their exchanges to stay open for normal operating hours on Tuesday.
The last time foul weather led to the closing of the stock markets was in October 2012 when Superstorm Sandy hit the East with flooding, punishing winds and widespread power outages.
The latest storm posed a fresh challenge to New York City mayor Bill de Blasio, under fire from police who criticised his support of public protests about white police violence against black men.
De Blasio was vilified for keeping schools open in the last major storm.
Vacationers and business travellers faced headaches as airlines cancelled around 3 000 US flights, with Boston and New York airports most heavily affected, according to flight-tracking service FlightAware.
New York authorities said "virtually all" flights at LaGuardia Airport on Tuesday would be canceled and cancellations at John F Kennedy International Airport would be "significant".
Amtrak suspended rail service on Tuesday between New York and Boston, and into New York state, Vermont, Massachusetts and Maine.
The biggest snowfall on record in New York City came during the storm of February 11-12, 2006, dropping 68 cm, according to the city's Office of Emergency Management.
