From Arlene to Sean, the 2011 Atlantic hurricane season had 19 major storms. The season saw advances forecasters have made in providing local emergency managers with timely warnings.
NYC helicopter crash into the East River killed one passenger and injured three others. Investigators are still trying to determine why the helicopter went down shortly after takeoff from a riverbank heliport.
With gusting winds, heavy rains, and major storm surges, hurricane Irene moved north toward major population centers, shutting down public transportation systems.