Before cloud formation water takes up heat from atmosphere to change into water vapor. When water
vapor changes back into liquid form as rain drops, this heat is released to the atmosphere warms the air around.The air tends to rise and causes a drop in pressure. More air rushes to the center of the storm. This cycle is repeated. The chain of events ends with the formation of a very low pressure system with very high speed winds revolving around it. It is this whether condition that we call a cyclone. Factors like wind speed, wind direction, temperature and humidity contribute to the development of cyclones.
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