Jack Beven, senior hurricane specialist, tracks Tropical Storm Isaac Wednesday, Aug. 22, 2012, at the National Hurricane Center in Miami. The U.S. National Hurricane Center on Wednesday morning said Isaac was expected to strengthen and could become a hurricane by Thursday. The storm is posing a potential threat to next week's Republican National Convention in Florida. (AP Photo/Alan Diaz)

Associated Press
Jack Beven, senior hurricane specialist, tracks Tropical Storm Isaac Wednesday, Aug. 22, 2012, at the National Hurricane Center in Miami.  The U.S. National Hurricane Center on Wednesday morning said Isaac was expected to strengthen and could become a hurricane by Thursday. The storm is posing a potential threat to next week's Republican National Convention in Florida. (AP Photo/Alan Diaz)
Jack Beven, senior hurricane specialist, tracks Tropical Storm Isaac Wednesday, Aug. 22, 2012, at the National Hurricane Center in Miami. The U.S. National Hurricane Center on Wednesday morning said Isaac was expected to strengthen and could become a hurricane by Thursday. The storm is posing a potential threat to next week's Republican National Convention in Florida. (AP Photo/Alan Diaz)
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