Origin and Definition of Cyclone  In 1848 Captain Henry Piddington first used the term cyclone. The word cyclone is derived from the Greek word 'kukloma', which in Bengali lexicon mik means 'coil of snake'.  According to AN Strahler, a low pressure center is called a vortex. When a small area of ​​land or water is suddenly heated, the air there becomes lighter and due to side pressure rises up and forms a strong low pressure cell or center at that place.  A steep atmospheric shield forms around the center in the lower atmosphere. Then the wind from all sides rushes towards the center in a coil shape with high speed and alternately rises and rises.  Concentric and upwardly moving high-speed rotating air around a strong low pressure cell is called a cyclone.  In the Northern Hemisphere, this type of wind flows in a clockwise direction, in the Southern Hemisphere, in a clockwise direction . Cyclones are observed in tropical and temperate regions. In some places it is ver