The United Nations says the death toll in Haiti from Tropical Storm Hanna exceeds 500 and is growing by the hour.
The storm deluged Haiti. It followed two other storms, Gustav and Fay, which left nearly 120 people dead.
The worst-hit city is the port city of Gonaives, where flooding has left about 200,000 people with little food or water.
About 3,000 people died there four years ago when the city was drowned by Tropical Storm Jeanne.
UN officials say it is difficult to get access and provide aid to affected areas.
The storm is now lashing the east coast of the United States, while Hurricane Ike threatens the Bahamas and Cuba.