Update as of 7:00 a.m. EST: At least 15 deaths in the Midwest and northeastern United States have been blamed on the latest storm, which has had its worst effect on Boston so far, NBC News reported. The winter storm is the second to hit the northeastern U.S. in less than a week.

At least 760 flights were cancelled Tuesday with New York's La Guardia, and airports in Boston, Chicago and Newark the worst hit, according to tracking service FlightAware. Schools remained closed in Boston on Tuesday, while a winter storm warning was lifted for northeastern Maine, where up to 18 inches of snow was forecast by Tuesday morning.  

Original story:

At least 11 deaths have been blamed on the latest winter snowstorm that hit the northeastern United States on Monday after it pummeled Midwest on Sunday. The second major storm to hit the region in less than a week also forced the delay of Boston’s Super Bowl victory parade until Wednesday.

Storm-related car crashes killed two people on Interstate 95 in New York on Monday, while two others were killed in Nebraska on Sunday. A woman was killed in Massachusetts on Monday after she was struck by a snowplow, while an Ohio police officer died of a heart attack while shoveling snow from a sidewalk on Sunday.

Boston's mayor announced that the New England Patriots victory parade was being delayed on account of bad weather.

“Due to today’s bad weather and the worsening forecast for tonight, the New England Patriots and the City of Boston have made the mutual decision to postpone the victory parade,” Martin J. Walsh, reportedly said in a statement. “We thank everyone for their flexibility and patience during the planning of this parade and we look forward to celebrating with Patriots fans during better weather on Wednesday.”

The National Weather Service had issued a “flash freeze” warning for New York City and Long Island, while warnings were also given out for Philadelphia as temperatures dropped.

National Weather Service forecaster Bill Simpson in Massachusetts said Monday night that areas where rain and slush pummeled on roads will "have a pretty difficult time when that slush freezes," The Associated Press reported. In northeastern Maine, up to 18 inches of snow was expected by Tuesday morning, forecasters reportedly said.

In New England, snowfall continued at a rate of 3 inches an hour on Monday. Lunenburg, Massachusetts, had more than 13 inches of snow, NBC News reported. Massachusetts Bay Transportation Authority warned riders about delays in commutation on Tuesday.

A snow emergency warning was declared in Boston, which had received 2 feet of snow from a blizzard last week, dubbed "Juno." Boston reportedly set a record for the snowiest seven-day period in the city's history.

“There are 27 inches in New York City; 35 inches in Chatham, Massachusetts; and 26 inches in Westhampton, New York. In all, more than 4,200 arrivals and departures were canceled at U.S. airports. That included more than 1,000 flights at Chicago O’Hare, more than 800 at LaGuardia in New York, 650 at Boston Logan and 600 at Newark Liberty in New Jersey," federal authorities reportedly said Monday night.