Formation and initial development state: Four atmospheric/ oceanic conditions are necessary for the formation of a cyclone namely:

A warm sea temperature in excess of 26 degree centigrade, to a depth of 60 meters, which provides abundant water vapour in the air by evaporation.

High relative humidity (degree to which the air is saturated by water vapor) of the atmosphere to a height of about 7000 meters, facilitates condensation of water vapor into droplets and clouds, releases heat energy and induces drop in pressure.

Atmospheric instability (an above average decrease of temperature with altitude) encourages considerable vertical cumulus cloud convection when condensation of rising air occurs.

A location of at least 4-5 latitude degrees from the Equator allow the influence of the force due to the earth’s rotation (Coriolis force) to take effect in inducing cyclonic wind circulation around low pressure centers.

(Start Quiz) Team 1

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