The National Weather Service says a tornado warning issued for the New York City boroughs of Brooklyn and Queens has expired, and a watch is in place.
The agency said radar had spotted rotating clouds in a severe thunderstorm approaching the area before 4 a.m. Sunday. The agency says the warning expired at 4:15 a.m. Sunday with a report of a toppled tree in the area but no immediate confirmation of any tornadoes.
Authorities had said that the approaching hurricane might spawn tornadoes. Irene is expected to make landfall in the New York City area at around 10 a.m.
A tornado watch remains in effect until 5 a.m. Sunday for New York City, Long Island and southern Connecticut. A tornado watch means conditions are favorable for tornadoes to form.