Thunderstorms that form over an area randomly and only last for approximately an hour are called: "ordinary thunderstorms".
There are two main kinds of storms, these are ordinary and severe thunderstorms. Ordinary thunderstorms are considered as the normal summer storm. Ordinary thunderstorms last around 60 minutes. The precipitation related with them is rain and once in a while little hail. This type of thunderstorm cloud can grow up to 12 kilometers high.