What is a prominent feature of a Thunderstorm cloud, specifically a cumulonimbus?

The prominent feature of a thunderstorm cloud, specifically a cumulonimbus, is the anvil. Cumulonimbus clouds are known for their towering structure, which can reach significant altitudes, often extending into the stratosphere. The upper portion of these clouds frequently spreads out in a characteristic anvil shape, which is formed by strong updrafts in the storm that carry moisture high into the atmosphere where it cools and condenses. This spread indicates the cloud's mature stage and is associated with severe weather phenomena like heavy rain, lightning, hail, and sometimes tornadoes.

Understanding the structure of cumulonimbus clouds, including the anvil feature, is crucial for pilots and remote pilots as it serves as an indicator of potential turbulence and severe weather conditions that could affect flight safety.