NOTES

Cyclones are centres of low pressure surrounded by closed isobars and having increasing pressure outwards. It has closed air circulation from outside towards the Central low pressure in such a way that air blow inward in anticlockwise in the Northern Hemisphere and clockwise in the S. Hemisphere. Cyclones range in shape circulars, elliptical to 'V shaped. Cyclone-immense influence on the climate and weather. Wherever they reach, they alter the temperature and precipitation conditions of the place. The origin of these cyclones is associated with the polar fronts, where two contrasting air masses converge.