The biggest storm to hit the Northeast this winter dropped a foot or more of snow along the New York-to-Boston corridor Thursday, turning roads treacherous, grounding flights and giving millions of people weather whiplash a day after temperatures soared into the 50s and 60s.

Schools closed in cities big and small, including New York City, Philadelphia and Boston, and government offices told non-essential workers to stay home.
More than 3,500 flights were canceled across the region and planes bound for New York’s Kennedy Airport were ordered held on the ground for hours while crews cleared the runways. A de-icing truck caught fire at Bradley Airport outside Hartford, Connecticut.

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People head out from subway into snow in Times Square during a winter storm in New York City on Feb. 9, 2017. (Gordon Donovan/Yahoo News) People hold their hoods as fight off high winds and snow as they cross the street in Times Square in New York City on Feb. 9, 2017. (Gordon Donovan/Yahoo News) People take photos in Times Square during a winter storm in New York City on Feb. 9, 2017. (Gordon Donovan/Yahoo News)
A NYC Sanitation truck plows the streets in Times Square section of New York City on Feb. 9, 2017. (Gordon Donovan/Yahoo News) Snow covers trees on Park Avenue on Feb. 9, 2017, in New York. (Gordon Donovan/Yahoo News) A woman carries an U.S. flag umbrella in Times Square to fight off the elements during a winter storm in New York City on Feb. 9, 2017. (Gordon Donovan/Yahoo News)
People enjoy the snow in Madison Square Park during a winter storm on Feb. 9, 2017, in New York. (Gordon Donovan/Yahoo News) People make their way through wind and snow in the Flatiron District on Feb. 9, 2017, in New York. (Gordon Donovan/Yahoo News) The reflections of people off the wet sidewalk as they pass the MetLife Building in New York City during a winter storm on Feb. 9, 2017. (Gordon Donovan/Yahoo News)
A news stand and phone booth are covered in slush along E. 42nd Street near Grand Central Terminal in New York on Feb. 9, 2017. (Gordon Donovan/Yahoo News) A bulldozer piles up snow in Times Square in New York City after a winter storm on Feb. 9, 2017. (Gordon Donovan/Yahoo News) Several women forgot their hats as they shield themselves against high winds and snow as they cross the street in Times Square in New York City on Feb. 9, 2017. (Gordon Donovan/Yahoo News)
A worker plows snow outside commercial buildings on Park Avenue in New York City after a winter storm on Feb. 9, 2017. (Gordon Donovan/Yahoo News) People use their umbrella as a shield to brace the high winds and snow as they cross the street in Times Square in New York City on Feb. 9, 2017. (Gordon Donovan/Yahoo News) Snow covers trees on Park Avenue mall on Feb. 9, 2017, in New York during a winter storm. (Gordon Donovan/Yahoo News)
The glass of a bus stop shelter is covered in snow on 3rd Avenue in New York City during a winter storm on Feb. 9, 2017. (Gordon Donovan/Yahoo News) A walk sign is down to zero is covered in snow on Park Avenue in New York City during a winter storm on Feb. 9, 2017. (Gordon Donovan/Yahoo News) New York City Sanitation trucks plow along E. 42nd Street near Grand Central Terminal in New York on Feb. 9, 2017. (Gordon Donovan/Yahoo News)

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Photos taken February 9, 2017 using a Canon EOS-1D X DSLR with a EF 24-70mm f/2.8L II USM Standard Zoom Lens.