Europe 1 with AFP 6.30am, September 2, 2021

Several cities, including New York and Philadelphia, were placed on tornado alert by the National Weather Service on Wednesday after the remnants of Hurricane Ida passed.

In New Jersey, hit by torrential rains, a state of emergency has also been declared by the governor. 

The remnants of Hurricane Ida, which killed at least seven people during its passage through the southern United States and has since weakened, caused several tornadoes and extensive flooding in the northeastern part of the country on Wednesday .

Impressive tornadoes have been seen in Pennsylvania, New Jersey and Maryland.

In Annapolis, a city located about fifty kilometers from Washington, this meteorological phenomenon uprooted trees and knocked down electric poles. 

Tornado alert

Several cities, including New York and Philadelphia, have been placed on tornado alert by the National Weather Service (NWS).

"This is an especially dangerous situation. Please take cover if you are in the area of ​​a tornado alert," NWS Mount Holly tweeted Wednesday.

“Take shelter NOW. Flying debris will be dangerous for those who are not sheltered,” tweeted Notify NYC, a New York City emergency communications program.

↪️ # Weather: spectacular flooding in #NewYork



@NYJuvehttps: //t.co/iWcRg351SM

- Eka Leladze (@leladze_eka) September 2, 2021

In New Jersey, hit by torrential rains, a state of emergency has been declared by Governor Phil Murphy.

Hurricane Ida, downgraded to a post-tropical cyclone, brought heavy rains in its wake, which caused extensive flooding on the east coast of the United States.

Seven dead after the passage of the hurricane

A 19-year-old has died and another is missing after a building flooded in Maryland on Wednesday, bringing Ida's death toll to seven.

"Post-tropical cyclone Ida brings widespread heavy rains and flash floods that can pose a fatal risk along and near its path," said the National Hurricane Center.

Ida is then expected to continue her journey north, and head to New England on Thursday.

President Joe Biden will travel to Louisiana on Friday, where Hurricane Ida, which made landfall there on Sunday, destroyed buildings and left more than a million homes without electricity. Hurricanes are a recurring phenomenon in the southern United States. But the warming of the ocean surface is helping to make storms more powerful, scientists warn. In particular, they pose an increasingly significant risk to coastal communities that are victims of wave-submersion phenomena amplified by rising sea levels.