For example some questions are still un-answered: (i) what is the cloud characteristic both on the windward and leeward sides of the WG when the entire cloud system evolves under the large scale monsoon circulation and how it progresses from the west to east direction? (ii) What are the typical temporal evolutions of monsoon clouds over the WG dur- ing the monsoon season? Understanding these processes can im- prove regional and climate models to simulate cloud structures.