Even before reaching hurricane strength, Isaac caused considerable inconvenience, with more than 550 flights canceled at Miami International Airport and about 150 from Fort Lauderdale's airport. There were scattered power outages from Key West to Fort Lauderdale affecting more than 16,000 customers, and flooding occurred in low-lying areas.
Gov. Rick Scott said that only minor damage was reported from Isaac.
Hurricane center forecasters are uncertain of the storm's path because two of their best computer models now track the storm on opposite sides of a broad cone. One model has Isaac going well west and the other well east. For the moment, the predicted track goes up the middle.
Before reaching Florida, Isaac was blamed for eight deaths in Haiti and two more in the Dominican Republic, and downed trees and power lines in Cuba.