Hurricane Florence, at center, is a Category 4 storm heading for the Carolinas. To the east, Hurricanes Isaac and Helene (far right) are seen in the Atlantic Ocean. To the west, a tropical disturbance has developed over the northwest Caribbean Sea.

Hurricane Florence, at center, is a Category 4 storm heading for the Carolinas. To the east, Hurricanes Isaac and Helene (far right) are seen in the Atlantic Ocean. To the west, a tropical disturbance has developed over the northwest Caribbean Sea.