Cyclone is a small low pressure area in the centre surrounded by high pressure. The winds blow spirally towards the low pressure area and form convergence of winds. In the northern hemisphere the direction of cyclonic winds is anti-clockwise and in the Southern hemisphere it is clockwise. The cyclones are classified into two types.
(i) Tropical Cyclones: The origin of tropical cyclones is much related to intensive They cause heavy rainfall with high-velocity winds. Tropical cyclones are highly dangerous and devastating.
(ii) Temperate Cyclones: In the temperate region, cyclones are produced by the meeting of warm air mass of tropical region and cold air mass of the polar region. The tropical. air mass is lighter and it is pushed up by the advancing dense cold air mass. The process of mixing of these two air masses takes palace in the form of cyclones. They are ‘ associated with heavy rainfall.
