Tropical cyclones form where heat and moisture from the surface of the ocean interact with a wind pattern that spirals air inward. The water vapor condenses into storm clouds which are further fueled by the heat and wind.
Cyclones form in the area around the equator. A low air pressure presses against the ocean which needs to be at least 26.5 degrees Celcius. The ocean temperature and air pressure push moisture up and and form clouds. The clouds start to rotate faster and faster creating a tunnel of clouds.