Isaac prompts hurricane warnings from La. to Fla.
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Credit: Getty Images
ST. PETE BEACH, FL - AUGUST 26: Area residents fill sand bags ahead of Tropical Storm Isaac August 26, 2012 in St. Pete Beach, Florida. According to reports, Isaac has become stronger as it moves toward the Florida Keys and forecasters say it could strengthen into a Category 2 storm. (Photo by Edward Linsmier/Getty Images)
