Thunderstorms develop in hot,humid tropical areas like India very frequently. The rising temperatures produce strong upward rising winds. These winds carry water droplets upwards,where they freeze ,and fall down again. The swift movement of the falling water droplets along with the rising air create lightning and sound. This is how thunderstorms formed.
Before cloud formation water takes up heat from the atmosphere to change into vapour. When water vapour changes back to liquid form as raindrops,this heat is released to the atmosphere. The heat released to the atmosphere warms rhe air around. The air tends to rise and causes the drop in pressure. More air rushes to the centre of the storm. This cycle is repeated. The chain of events ends with a formation of a very low-pressure system with very high speed winds revolving around it. It is the weather condition that we call a cyclone.