Which type of cloud is known for its potential to produce heavy rain and thunderstorms?

Cumulonimbus clouds are characterized by their towering structure and significant vertical growth, reaching high altitudes in the atmosphere. These clouds are commonly associated with thunderstorms and severe weather phenomena. They have a dense, moist core that can develop into strong updrafts, contributing to the formation of precipitation. The combination of these characteristics makes cumulonimbus clouds capable of producing heavy rain, lightning, thunder, and even severe weather conditions such as hail or tornadoes.

In contrast, cumulus clouds are often fluffy and white but generally indicate fair weather unless they develop into larger storm clouds. Stratus clouds typically form in uniform layers, resulting in overcast skies and light drizzle rather than heavy rain. Altostratus clouds usually appear as a gray or blue-gray layer and can produce light precipitation, but they do not reach the intensity of thunderstorms associated with cumulonimbus clouds. Thus, the distinct structure and behavior of cumulonimbus clouds set them apart as the primary cloud type for severe weather events.