Isaac gains strength as it heads toward the Gulf Coast

With its massive size and ponderous movement, Tropical Storm Isaac was gaining strength Monday as it headed toward the Gulf Coast. The next 24 hours would determine whether it brought the usual punishing rains and winds - or something even more destructive harkening back to the devastation wrought seven years ago by Hurricane Katrina.

Isaac gains strength as it heads toward the Gulf Coast

With its massive size and ponderous movement, Tropical Storm Isaac was gaining strength Monday as it headed toward the Gulf Coast. The next 24 hours would determine whether it brought the usual punishing rains and winds - or something even more destructive harkening back to the devastation wrought seven years ago by Hurricane Katrina.

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