More than 120,000 homes in the northeastern United States have been unpowered since the tropical cyclone Henri landed on Rhode Island.
Henri was downgraded from a Category 1 hurricane, but the storm still brought in a wind of 60mph (95km / h).
Millions of people on Long Island and southern New England are told to prepare for coastal surges, floods, and collapse of trees and power lines.
Meanwhile, further south of Tennessee, flash floods have killed at least 21 people.
Dozens of people remain missing in and around the town of Waverley, about 60 miles (90 km) west of Nashville, after local reporters have described unprecedented rainfall.
The rising water uprooted huge trees, tore homes, left hundreds uninhabited, and wiped out cars. Roads and bridges were damaged, and thousands of people in Humphreys County lost power.
The Humphreys County Sheriff’s Office said on a Facebook page that a unified center had been set up at the school and people were asked to donate items to help refugees.
President Joe Biden expressed “deep condolences” to the affected people, saying disaster authorities are ready to provide assistance where they are needed.
He also approved disaster relief in Rhode Island, Connecticut, and New York. These states are expected to be hit hard by Storm Henri.
“This storm has the potential to spread throughout the region, with serious floods and power outages that can affect hundreds of thousands of people,” he said.
According to the National Hurricane Center, Henri struck land near Westerly, Rhode Island, around 12:15 local time (Greenwich Mean Time 16:15), with maximum sustained winds just 14mph (22kph) below the strength of the hurricane.
“Heavy rains from Henri can cause significant flushes, urban and stream floods, and small to isolated medium river floods can be widespread,” the NHC said.
Hundreds of flights from New York Airport have been cancelled.
Police said the concert on Saturday night in Central Park, New York City, was abruptly canceled “due to bad weather.”
It was believed that about 60,000 people were attending the “Homecoming” concert. This is a celebration of the return to hosting a major event, subject to pandemic restrictions.
The artist lineup also included Bruce Springsteen, Patti Smith, Paul Simon, and Barry Manilow. Performance was shortened because those who went to the concert were told to go to the nearest exit.
New York Governor Andrew Cuomo said he was particularly concerned about the potential for flooding in the state’s Hudson River Valley and Catskill Mountains.
“The storm is slow after hitting Long Island. When the storm is slow, it keeps raining for a long time, so a slow storm is a problematic storm,” he said.
“Because we already have saturated ground, the absorption capacity of the ground is limited, and that makes this level of rainfall a particular problem.”
Before the storm was downgraded, about 6 million people living near some coasts in Long Island, Connecticut, and Massachusetts had been issued hurricane alerts.
Most of southern New England, and more than 36 million people in New York and New Jersey, have received tropical cyclone alerts.
Massachusetts has closed parks and beaches until Monday, according to Massachusetts Governor Charlie Baker’s office.
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