Explanation:

Some other conditions which are favourable for the formation of Tropical cyclone are given below:
1)    Large sea surface with temperature higher than 27° C
2)    Presence of the Coriolis force enough to create a cyclonic vortex
3)    Small variations in the vertical wind speed
4)    A pre-existing weak low-pressure area or low-level-cyclonic circulation
5)    Upper divergence above the sea level system