Answer: High-level cyclonic circulation
Notes: Cyclone is any low-pressure area with winds spiralling inwards.
Conditions Favourable for Tropical Cyclone Formation include:
Large sea surface with temperature higher than 27° C,
Presence of the Coriolis force enough to create a cyclonic vortex,
Small variations in the vertical wind speed,
A pre-existing weak low-pressure area or low-level-cyclonic circulation,
Upper divergence above the sea level system.
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