Dr. Rick Knabb, director of the National Hurricane Center, shows some of the possible trajectories tropical storm Isaac could develop in the coming days, Wednesday, Aug. 22, 2012, at the National Hurricane Center in Miami. As of 11:00 AM tropical storm Isaac's location 15.9 degrees north, 59.3 degrees west, about 140 miles east of Guadeloupe, maximum sustained winds 45 mph, present movement west or 280 degrees at 21 mph. (AP Photo/Alan Diaz)

Associated Press
Dr. Rick Knabb, director of the National Hurricane Center, shows some of the possible trajectories tropical storm Isaac could develop in the coming days, Wednesday, Aug. 22, 2012, at the National Hurricane Center in Miami. As of 11:00 AM tropical storm Isaac's location 15.9 degrees north, 59.3 degrees west, about 140 miles east of Guadeloupe, maximum sustained winds 45 mph, present movement west or 280 degrees at 21 mph. (AP Photo/Alan Diaz)
Dr. Rick Knabb, director of the National Hurricane Center, shows some of the possible trajectories tropical storm Isaac could develop in the coming days, Wednesday, Aug. 22, 2012, at the National Hurricane Center in Miami. As of 11:00 AM tropical storm Isaac's location 15.9 degrees north, 59.3 degrees west, about 140 miles east of Guadeloupe, maximum sustained winds 45 mph, present movement west or 280 degrees at 21 mph. (AP Photo/Alan Diaz)
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