Cyclone: n. a type of atmospheric disturbance characterized by masses of air rapidly circulating clockwise in the Southern Hemisphere and counter-clockwise in the Northern Hemisphere.

    A cyclone is a low-pressure area in the atmosphere, in which winds spiral inward. A cyclone can cover half the U.S. Cyclones have two characteristics. One is that the atmospheric pressure is lowest at the center. The other is that the winds spiral inward towards the center. In the Northern Hemisphere, the winds blow in a counter-clockwise direction. But, in the Southern Hemisphere, the winds go in a clockwise direction.