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Cyclones are low-pressure area in the atmosphere in which winds spiral inward, having the following two characteristics.
The atmospheric pressure is lowest at the centre
The winds spiral in toward the centre.
In the Northern Hemisphere, the winds blow counterclockwise toward the centre. In the Southern Hemisphere, they blow inward in a clockwise direction.
Cyclones are of many different types and occur all over the world. The strongest types of cyclones are tropical cyclones. Most of these cyclones form in regions consisting of a worldwide band known by several different names such as Intertropical Front, Intertropical Convergence Zone, and monsoon trough.
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