State police respond to a stranded motorist along Route 7 eastbound during a nor'easter in Colonie, NY.

A woman struggles with her umbrella while walking her dog past a foggy view of the Manhattan skyline during a large storm in Brooklyn.

Workers drive through a flooded street during rain and high winds in the Broad Channel section of Queens in New York.

A tree that fell during strong winds laying across East 91st Street near Second Avenue in New York, NY.

Winter Storm Riley pounded a wide swath of the US from the Great Lakes to the Big Apple on Friday, with a heavy mix of rain, snow, flooding and strong winds, forecasters said.

More than 900,000 homes and businesses were without power as the second “bombogenesis” storm of the season struck, Weather.com reported.

About 80 million people are in the storm’s path along the East Coast, CNN reported.

Nearly 2,900 domestic flights were already canceled by Friday afternoon, mostly in the Northeast, according to the tracking website FlightAware. These include all arriving and departing flights at LaGuardia, nearly a third of flights at JFK, and about a quarter of flights at Newark, according to tweets posted by the airports. Air Train at Newark has also been suspended and replaced by shuttle buses.

Two other tractor-trailers overturned on the Verrazano Bridge, less than an hour apart Friday afternoon.

The first happened at around 1:10 p.m. on the upper roadway, with the driver taken to Staten Island University Hospital for a minor injury, authorities said. The second tractor overturned at about 2 p.m. There were no injuries reported.

Amtrak service is also temporarily suspended between New York City and Boston.

New York City ferries along the Rockaway route — and the South Brooklyn route’s landings in Bay Ridge and Sunset Park — have been suspended until further notice. Service will be limited to Pier 11 to Red Hook until further notice. The Astoria route is operating on a regular schedule, according to a new alert.

Dramatic video tweeted by CBS New York shows a tractor-trailer rig tipping over while crossing the Mario Cuomo Bridge in the pouring rain and heavy winds.

The city’s Department of Buildings ordered sites to secure their cranes and all outdoor equipment at risk of falling and blowing away.

And Gov. Andrew Cuomo activated the state’s emergency management apparatus, he said in a statement.

“As the saying goes, March is coming in like a lion,” Cuomo said. “I am asking everyone to listen to weather forecasts in your community and take the necessary precautions to prepare for conditions.”

An inch or two of snow — at most — is expected in New York City throughout the day, but “even that’s not a slam dunk,” Accuweather senior meteorologist Dave Dombek told The Post. The precipitation is expected to wind down overnight, with some possible light rain to close out around midnight, Dombek said.

But the precipitation isn’t the worst of it, he said.

“The biggest ticket item is going to be the wind,” Dombek said. “We’re looking at winds gusting 50 to 60 mph or even over 60 mph.”

Wind gusts are expected to remain at 45 to 50 mph on Saturday, and ease up a bit by Sunday, he added.

Temperatures will remain around 37 degrees throughout the day on Friday. A high temperature of 45 degrees is expected on Saturday and 47 on Sunday.

New York City won’t be the worst affected by the storm, though, according to Dombek. New England — including Cape Cod and Nantucket — will see substantial flooding and beach erosion, Dombek said.

Streets in Quincy, Mass., were buried by rising floodwaters on Friday, according to shocking tweets posted by local police.

“Ladies and gentlemen…PLEASE…This not only endangers your life, but the lives of first responders,” Quincy Police wrote Friday morning, with the hashtag #TurnAroundDon’tDrown. An accompanying photo shows a lake-like body of water in the middle of a residential street, with a car almost completely covered.

In New Jersey, officials are concerned that the severe storm could severely damage beaches south of Atlantic City that are still being repaired after previous storms.

In Virginia, winds gusted to 71 miles per hour at Washington-Dulles International Airport by late Friday morning, according to a tweet from the National Weather Service.

And another Twitter user posted a photo of a tractor-trailer tipped on its side on the Newport Bridge in Rhode Island.

Although a similar storm, dubbed a “bomb” cyclone,” struck the Northeast back in January, Dombek said this kind of weather is to be expected.

“To get a storm to reach the East Coast and go through rapid intensification — we still go through a few of these storms every year,” he said.

Additional reporting by Joe Marino