Hurricanes such as Hurricane Katrina are formed over warm ocean waters during the summer and autumn months. Water vapour from the ocean waters condenses and causes storm clouds and rain. Usually wind would limit the thunderstorm but when there is little wind the warm condensed water vapour can create an area of low pressure. As the warm air moves inward and spirals it creates the 'eye of the hurricane.' As the warm winds are moving they cause more water to evaporate and feed an already growing thunderstorm with rain! The centre or eye of the hurricane is calm and warm because of the sinking air.
http://video.google.com/videosearch?q=hurricane+ike+&emb=1&aq=f#q=satelite%20hurricanes&emb=1
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