The National Weather Service warned that the next high tide around noon EST (1700 GMT) would bring renewed flooding, with a surge of up to 3 feet (0.9 m) and waves of up to 25 feet, and a warning was in effect for virtually the entire New England coastline.
The storm also dumped heavy snow from OH to New England and into upstate NY, where more than 3 feet was recorded.
At least five people died in the storm, all killed by falling trees, authorities said.
This one is expected to last through early Saturday.
The storm - with about 80 million people in its path, including more than 22 million people under a coastal flood warning - officially "bombed out" late Friday morning when it underwent bombogenesis, signaled by an extreme drop in atmospheric pressure.
The National Weather Service says rain and snow should slowly come to an end early Saturday, hanging on across southern New England the longest. Falling trees killed seven people, including two boys who died when trees struck their homes, in Connecticut, Maryland, New York, Pennsylvania, Rhode Island and Virginia, according to local media and police. "We got a couple of sump pumps", said Shaffer, who evacuated to higher ground Thursday night. The agency said more than 160,000 power outages had been reported in the state by 5 p.m. ET.
The Massachusetts Emergency Management Agency stated that by late Friday morning, parts of the state had received eight inches of snowfall and could receive up to 18 inches of total snowfall throughout the duration of the storm.
The nor'easter has also prompted the cancellation of more than 3,300 flights, snarled ground traffic and knocked out power to 900,000 customers with more than 400,000 of them in MA, reports CNN.
Numerous roads were closed due to debris, fallen trees and power lines - including lanes on I-95 outside of Washington, D.C. Rail service across the Northeast was impacted significantly, with Amtrak suspending all service on the Northeast Corridor line. Widespread street flooding was reported in eastern MA with storm surge reported to be as high as 3 feet.
"This storm is going to be worse", she told WCVB, "because it's going over three high tides". MA emergency officials said tides "will be astronomically high" in the next few days. "Once you saw the National Guard, that's when I was like, 'OK, we should have evacuated'". Localized areas in the state may receive up to five inches of rain as well.
In New Jersey, officials are also expecting heavy rain to flood some rivers and streams, affecting drainage.
The storm's impact waned in the southern part of the coast, but forecasted wind gusts of up to 70 miles per hour still prompted building closures and delays in some areas.
In Boston, high wind warnings are in effect from Friday to Saturday morning, when winds could whip up to 65 miles per hour.
So far on Friday, at least 2,400 flights have been cancelled across the United States, including more than 1,000 flights in New York's Newark, LaGuardia and John F. Kennedy airports, according to the FlightAware.com.
The high winds and rainfall made power failures a hard issue.
Barges carrying construction materials broke loose from their moorings near the Tappan Zee Bridge, which crosses the Hudson River, said Laura Ware, public involvement manager for Tappan Zee Constructors LLC. Some areas around Buffalo in western NY have reported 17 inches already, and locations in upstate NY could approach 2 feet.