Well-developed cumulonimbus clouds are characterized by a flat, anvil-like top (anvil dome), caused by wind shear or inversion near the boundary between the troposphere and the stratosphere. These clouds are capable of producing lightning, heavy rain, high winds, and/or other dangerous severe weather, such as tornadoes and hailstones.
Types
Cumulonimbus calvus: Latin for "bald", features a puffy top
Cumulonimbus capillatus: Latin for "long hair", features ice crystal clouds that streak out at its top edge giving it a fibrous appearance
Cumulonimbus capillatus incus: Also known as an "anvil cloud" (incus being Latin for anvil), features a flat, anvil-top shape
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