Tropical Storm Isaac heads for northern Gulf Coast after lashing Carribean

Monday, August 27, 2012 | 7:44 a.m. CDT; updated 9:48 a.m. CDT, Monday, August 27, 2012

Tropical Storm Isaac has lashed the Florida Keys and South Florida with wind and rain, but may become an even stronger hurricane as it makes its way toward the northern Gulf Coast.

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