Among them, four women, three men and a 2-year-old boy died in the basements of residential homes in separate flooding incidents in Queens, according to an NBC report, citing New York Police Department Commissioner Dermot Shea.

Many commuters were stranded overnight in New York subway stations, some sleeping on benches with service suspended and no way to get to their destinations, according to local media reports.

Central Park at New York City on Wednesday recorded 3.15 inches of rainfall in just one hour, surpassing the previous recorded high of 1.94 inches in one hour during Tropical Storm Henri on Aug. 21.

There were three people reported killed in Pennsylvania, one in Maryland and one in Connecticut. Authorities also located the body of a Virginia resident missing in flooding earlier this week.

In the Philadelphia area, some streets were swamped, delaying the city's rail and bus services and causing thousands of rescues, according to a CNN report, citing state Emergency Management Agency Director Randy Padfield.

New York Governor Kathy Hochul declared a state of emergency early Thursday about an hour after New York City Mayor de Blasio declared one due to what he called a "historic weather event ... with record breaking rain across the city, brutal flooding and dangerous conditions on our roads" as Ida remnants raced up the East Coast.

"There's a lot of damage, and I made clear to the governors that my team at ... FEMA (the Federal Emergency Management Agency) is on the ground and ready to provide all the assistance that is needed," U.S. President Joe Biden said Thursday.

Senate Majority Leader Chuck Schumer Thursday stressed the need to spend more on infrastructure and climate change given the extreme flooding in the New York metropolitan area.

"When you get two record rainfalls in a week, it's not just coincidence. Woe is us if we don't recognize these changes are due to climate change," said Schumer in a press briefing on Thursday morning.

Before moving to slam the U.S. Northeast, Ida had already wrecked widespread havoc in southern U.S. states Louisiana and Mississippi, leaving four people dead and hundreds of thousands of people with power outages.

Ida landed on Sunday, the 16th anniversary of Hurricane Katrina's destructive strike, tying with 2020's Hurricane Laura and the Last Island Hurricane of 1856 as the strongest ever to hit Louisiana. It was downgraded to a tropical depression on Monday afternoon and moved inland with torrential rain.