Which type of cloud is responsible for creating thunderstorms?

Cumulonimbus clouds are specifically known for their association with thunderstorms. These clouds are large, towering, and often have a characteristic anvil shape at the top. They form when warm, moist air rises rapidly, creating powerful updrafts that lead to significant convection. As the air ascends, it cools and condenses, leading to precipitation and the potential for lightning and thunder. The severe weather phenomena, such as heavy rain, hail, and strong winds, often accompany these clouds due to the intense energy and moisture they contain.

The other cloud types listed are generally associated with different weather conditions. Cirrus clouds are high-altitude clouds that indicate fair weather but do not cause storms. Stratus clouds are low, uniform clouds that typically bring overcast skies and light precipitation but lack the convective energy of cumulonimbus clouds. Nimbostratus clouds produce steady, light to moderate rain but do not have the vertical development and intensity needed to generate thunderstorms. Thus, cumulonimbus is the clear answer when identifying the clouds responsible for thunderstorm activity.