Snow socked the Northeast again on Monday, crippling major airports and hindering the recovery from the blizzard last week. Forecasters warned that brutal cold would follow, raising the threat of a flash freeze and an icy mess on Tuesday.
In New England, the snow on Monday fell as fast as 3 inches an hour. By early afternoon, Lunenberg, Massachusetts, had more than 13 inches—and that was on top of what still had to be cleared from the blizzard.
New York got a mix of snow and freezing rain, complicating the commute. The Federal Aviation Administration briefly stopped flights from landing at LaGuardia Airport.
In all, more than 3,400 flights were canceled across the country. That included half the flights scheduled to take off and land at Newark Liberty International Airport in New Jersey.
Forecasters said temperatures would take a deep drive on Monday night. By 7 a.m. Tuesday, The Weather Channel called for readings of 18 degrees in Philadelphia, 14 in New York, 5 in Boston and 4 below zero in Burlington, Vermont.
In Boston, Mayor Marty Walsh said the city would go ahead anyway with a Tuesday parade to honor the Super Bowl champion New England Patriots.
"I think it's going to be a pretty significant undertaking, but I think our Boston authorities can take care of it, especially for the Pats," Keya Rahnemoon told NBC News on Boylston Street, where snow was piled waist-high along the sidewalks.