In New York City, the worst of the storm was expected from Saturday afternoon through this afternoon, with snow accumulations of 3-6 inches, followed by rain that could turn to ice as temperatures drop later today.
The storm moved Saturday toward the Northeast and New England. For instance, the temperature in Boston could drop to 6 degrees Fahrenheit (-14 degrees Celsius) on Sunday.
"Any water that remains on the road will freeze into a sheet of ice and make conditions quite hazardous", said Rich Otto, a meteorologist with the National Weather Service (NWS).
Officials warned people to limit their time outside to prevent frostbite and avoid treacherous travel conditions.
Strong wind gusts beginning tomorrow afternoon could bring down snow- or ice-burdened tree limbs and power lines.
As of Sunday at noon, utilities in CT were reporting more than 19,000 customers without power and more outages were expected in the region as ice accumulated on trees and power lines.
"We had more freezing rain and sleet than we expected", Hartford Mayor Luke Bronin said Sunday as public works crews across the state raced to clear and treat major roadways before risky black ice could form.
The storm was caused by the clash of an Arctic high pressure system with a low pressure system coming through the Ohio Valley, said National Weather Service meteorologist Dan Hofmann.
More than 900 domestic flights had been canceled and another 3,100 delayed as of 4 p.m. EST (2100 GMT) on Friday, according to Flightaware.com, an online tracking service.
Among the hardest hit was Boston's Logan Airport, where stranded passengers lingered Sunday as typically bustling security lines, ticketing counters and baggage claims were largely deserted.
A United Airlines plane has skidded off a runway at Chicago's O'Hare International Airport amid snowy and icy weather. He said the couple hoped to board a flight Sunday night. "Our top priority is the safety of New Jerseyans, and we urge residents to stay off the roads and prepare for potential power outages", said Gov. Phil Murphy.
Amtrak canceled some trains Saturday from Chicago to Washington and NY and between NY and Boston and Pennsylvania on Sunday.
A major winter storm that blanketed most of the U.S. Midwest with snow earlier in the weekend barrelled toward New England Sunday, where it was expected to cause transportation havoc ranging from slick and clogged roads to hundreds of cancelled airline flights. In Kansas, a snowplow driver was killed when his vehicle rolled over.
One saving grace of the storm: heavily populated coastal communities from NY to Boston largely escaped major snowfall after days of sometimes dire predictions.
Mountain regions saw significantly more, with the Adirondacks in upstate NY registering up to 20 inches while western Massachusetts' Berkshires saw as much as 10 and parts of northern New England were on track to see up to two feet of snow.
Mountain regions saw significantly more, to the delight of ski resort operators.
Other areas of OH received more snow than Trumbull County, but nowhere near the foot that was previously predicted, with Toledo receiving 5.7 inches and Mansfield receiving 6 inches.
"We think it's great", said Nicholas Nicolet. But, as he's done in the past, Trump conflated the short-term weather phenomenon with longer-term climate change.
"Amazing how big this system is", Trump tweeted.