andlt;strongandgt;Eye of hurricane Isabel.andlt;/strongandgt; This image was takenfrom the International Space Station on 15thSeptember 2003. At this time, the hurricane hadnot made landfall, and was classed as andlt;emandgt;categoryandlt;/emandgt;5, the strongest type of hurricane. At thisstage, the winds were gusting at over 250kilometres per hour. Hurricanes are enormousrotating storm systems that typically form in latesummer. They are powered by evaporation from awarm sea surface, and weaken as they pass overland. Hurricane Isabel is one of the largest andmost powerful hurricanes of recent years. It hitthe east coast of the USA on 18th September 2003.