A steady stream of cars move north in the middle Keys as the Florida Keys prepare for Tropical Storm Isaac, Saturday, Aug 25, 2012. Florida Gov. Rick Scott had declared a state of emergency and a hurricane warning has been issued for the Florida Keys, as officials warn tourists to leave. (AP Photo/The Miami Herald, Walter Michot)

Associated Press
A steady stream of cars move north in the middle Keys as the Florida Keys prepare for Tropical Storm Isaac, Saturday, Aug 25, 2012. Florida Gov. Rick Scott had declared a state of emergency and a hurricane warning has been issued for the Florida Keys, as officials warn tourists to leave. (AP Photo/The Miami Herald, Walter Michot)
A steady stream of cars move north in the middle Keys as the Florida Keys prepare for Tropical Storm Isaac, Saturday, Aug 25, 2012. Florida Gov. Rick Scott had declared a state of emergency and a hurricane warning has been issued for the Florida Keys, as officials warn tourists to leave. (AP Photo/The Miami Herald, Walter Michot)
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