Tropical Storm Isaac, in the lower right corner, moves over the Lesser Antilles in a satellite image from the National Oceanic and Atmospheric Administration taken on Wednesday, Aug. 22, 2012, at 1:45 p.m. EDT. (AP Photo/Weather Underground)

Tropical Storm Isaac, in the lower right corner, moves over the Lesser Antilles in a satellite image from the National Oceanic and Atmospheric Administration taken on Wednesday, Aug. 22, 2012, at 1:45 p.m. EDT. (AP Photo/Weather Underground)