Winter Storm Grayson is a rare snow hurricane and the first to hit the U.S. since Hurricane Sandy.
Winter Storm Grayson is churning up the East Coast.
"Visibility will be zero or down to zero at times with travel highly discouraged," the National Weather Service warned.
Roughly 50 million people on the Eastern Seaboard are subject to storm or blizzard watches through Tuesday.
Up to a foot and a half of snow expected in parts of New York, New Jersey, Connecticut.
Up to 50 million people could be affected by what meteorologist Nick Gregory calls a "classic nor'easter."
Snowstorm could affect up to 60 million people in almost a dozen states.
More than 3,000 flights have been canceled due to the winter storm headed for New England.