What is the second stage of a thunderstorm called?

The second stage of a thunderstorm is called the mature stage. During this phase, a thunderstorm reaches its peak intensity. It is characterized by heavy rainfall, strong winds, thunder, and lightning. This stage occurs after the initial stage, where the storm begins to develop and form. In the mature stage, the storm is capable of producing severe weather phenomena, including hail and tornadoes, due to the strong updrafts and downdrafts present. The presence of both rising and descending air in this phase contributes to the storm's strength and dramatic weather effects. This stage is critical because many of the most dangerous weather events associated with thunderstorms occur during this time.

The initial stage involves the formation of the storm with weaker activity, while the dissipating stage occurs afterward, where the storm begins to lose energy and rainfall decreases. The developing stage does not signify the peak intensity, which is why the mature stage is rightly identified as the correct answer.