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Tom Pennington / Getty Images
A pedestrian walks around temporary security fencing in downtown Tampa, Fla., as rain showers move through the area on Aug. 25. Tampa area residents wait for Tropical Storm Isaac as they prepare for the Repulican National Convention which will be held in Tampa during the week of August 27th.
Florida Gov. Rick Scott on Saturday declared a state of emergency to make sure local and state agencies would be ready.
Isaac is a massive storm, with tropical storm-force winds extending 230 miles from the center. Key West International Airport was halting all flights at 7 p.m. Saturday until the storm had passed.
-- Reported by NBC News and wire services
Walter Michot / AP
Tropical Storm Isaac rakes the Dominican Republic, Haiti and Cuba as it makes its way toward Florida, where Tampa will be hosting the Republican National Convention.
The Weather Channel's Bryan Norcross tracks Tropical Storm Isaac's movement and predictions about where it is headed.