When air moves slowly (low speed), it is called a breeze; when it moves quickly (high speed), it is called a storm. When the pressure of the airdrops, it suggests the probability of a storm.Thunderstorms are caused by the rapid movement of falling water combined with rising heated air, resulting in sound, lightning, heavy rain, and Very strong wind. It occurs in hot, humid tropical areas such as India and is followed by torrential rains or hail. Thunderstorms are caused by black clouds that originate at relatively low altitudes in the atmosphere. In the tropics, the air warms up and rises, while humidity produces water vapor for the development of clouds.As a result, it may be stated that for a thunderstorm to form, moisture, swiftly rising warm air, and a sea breeze or mountains are required.