What is a characteristic of cumulonimbus clouds?

Cumulonimbus clouds are a key indicator of severe weather conditions and are often associated with intense atmospheric instability. These towering clouds can reach great heights, extending into the upper atmosphere, and they are capable of producing a variety of severe weather phenomena, including thunderstorms, heavy rain, hail, and tornadoes. The vertical development of cumulonimbus clouds contributes to significant turbulence due to the strong updrafts and downdrafts occurring within and around them.

This characteristic makes them distinct from other cloud types that are typically associated with more stable weather. For instance, other cloud formations like stratus or nimbostratus are indicative of stable weather conditions and are associated with lighter precipitation. Therefore, cumulonimbus stands out due to its link with severe weather, which includes not just visual indicators like lightning and heavy precipitation, but also turbulent air conditions that can greatly affect flying operations.