Tropical cyclones begin over water that is warmer than 27 degrees celsius( 80 degrees Fahrenheit) slightly north or south of the earth's equator. Warm, humid air full of water vapor moves upward. The earth's rotation causes the growing storm to start to rotate around its center( called the eye). At a certain height, the water vapor condenses, changing to liquid and releasing heat. The heat draws more air and water vapor upward, creating a cycle as air and water vapor rise and liquid water falls. If the cycle speeds up until winds reach 118 kilometers per hour, the storm qualifies as a tropical cyclone.
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