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KEY WEST, FL - AUGUST 25:  Two men install storm shutters on Duval Street on August 25, 2012 in Key West, Florida.  Residents in the Florida Keys are preparing after a Hurricane Warning was issued as Tropical Storm Isaac tracks north.  (Photo by Marc Serota/Getty Images)
KEY WEST, FL - AUGUST 25:  Two men install storm shutters on Duval Street on August 25, 2012 in Key West, Florida.  Residents in the Florida Keys are preparing after a Hurricane Warning was issued as Tropical Storm Isaac tracks north.  (Photo by Marc Serota/Getty Images)

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    Isaac approaches Florida's coast

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Isaac approaches Florida's coast

CNN's Bonnie Schneider tracks the latest movements of Tropical Storm Isaac.

Isaac approaches Florida's coast

CNN's Bonnie Schneider tracks the latest movements of Tropical Storm Isaac.