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Word Count: 598
Hurricanes Hurricanes get their start over the warm tropical waters of the North Atlantic Ocean near the equator Most hurricanes appear in late summer or early fall when sea temperatures are at their highest The warm waters heats the air above it and the updrafts of warm moist air begin to rise Day after day the fluffy cumuli form atop the updrafts But the cloud tops rarely rise higher than about 6000 feet At that height in the tropics there is usually a layer of warm dry air that acts like an invisible ceiling or lid Once in a while something happens in the upper air that destroys this lid Scientist do not know how this happens But when it does its the first step in the birth of a hurricane With the lid off the warm moist air rises higher and higher Heat energy released as the water vapor in the air condenses As it condenses it drives the upper drafts to heights of 50000 to 60000 feet The cumuli become towering thunderheads From outside the storm area air moves in over the sea surface to replace the air soaring upwards in the thunderheads The air begins swirling around the storm center for the same reason that the air swirls around a tornado center As this air swirls in over the sea surface it soaks up more and more water vapour At the storm center this new supply of water vapor gets pulled into the thunderhead updrafts releasing still more energy as the water vapor condenses This makes the updrafts rise faster pulling in even larger amounts of air and water vapor from the storms edges And as the updrafts speed up air swirls faster and faster around the storm center The storm clouds moving with the swirling air form a coil In a few days the hurricane will have grown greatly in size and power The swirling shape of the winds
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