CBS News
AP, August 26, 2012 7:22 AM
A steady stream of cars moves north in the middle Keys as Florida prepares for Tropical Storm Isaac, Saturday, Aug 25, 2012. Florida Gov. Rick Scott had declared a state of emergency. (AP/The Miami Herald, Walter Michot)
(CBS/AP) MIAMI - Tropical Storm Isaac gained fresh muscle Sunday as it bore down on the Florida Keys, threatening to be at or near hurricane strength approaching the island chain, and forecasters warned Isaac could grow into an extremely dangerous Category 2 hurricane on an expected track toward the northern Gulf Coast.
Isaac's drew new strength early Sunday during a warm-water crossing of the Florida Straits after causing weekend havoc in Cuba, where it downed trees and power lines, and after leaving four dead earlier in Haiti.
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