What are the basic requirements for the formation of a cyclone?
There are four basic requirements for the formation of a tropical cyclone. First, there must be a large and continuous supply of warm and moist air that can release enormous latent heat to energise the system.
Second, a strong Coriolis force is required to prevent the filling of low pressure at the centre. This is why tropical cyclones do not form near the equator, specifically between 0°-5° latitude, where the Coriolis force is absent.
Third, there must be unstable conditions through the troposphere to create local disturbances for development. Finally, there should be an absence of strong vertical wind wedge, which otherwise disturbs the vertical transport of latent heat.
Explanation
The answer is based on the 'initial conditions for the emergence of a tropical cyclone' listed in the textbook context. It covers the four distinct points: (i) supply of warm/moist air for latent heat, (ii) the necessity of the Coriolis force (and the latitude constraint), (iii) atmospheric instability, and (iv) the absence of strong vertical wind shear (wind wedge).