Some of the U.S.'s biggest cities braced for what's expected to be another mammoth snowfall in the Midwest and the Northeast — with as much as a foot and a half forecast through Friday.
Winter storm warnings stretched from Chicago through the New York tri-state region into New England — affecting an area home to almost 40 million people.
(Read more: Let it snow: Determined shoppers will 'find a way')
The National Weather Service issued a blizzard warning for Nassau and Suffolk counties on Long Island in New York beginning at 6 p.m. ET Thursday, predicting inch-an-hour snow with 45-mph winds during the worst of it Thursday night.
"It's going to be a pretty significant storm, which will cause major travel disruption for a lot of people early in the new year," said Dave Houtz, senior meteorologist for The Weather Channel. "Any untreated roads will be a real mess."