Cumulonimbus cloud

Cumulonimbus (Cb) is a type of cloud that is tall, dense, and involved in thunderstorms and other intense weather. When seen in a storm, it may be called "thunderhead". The clouds can form alone, in clusters, or along a cold front in a squall line, a line of strong winds. Cumulonimbus clouds form from cumulus clouds (namely from cumulus congestus cloud) and can further develop to a supercell, a severe thunderstorm with special features. Cumulonimbus clouds are the source of most tornadoes.

Cumulonimbus Cloud Media

Cumulonimbus calvus cloud in Monterrey, Mexico.
Partial view of a cumulonimbus cloud, possibly an arcus cloud.
Pyrocumulonimbus with pileus
Stages of a cumulonimbus cloud's life.
Transformation from a mature cumulus congestus cloud to a mature cumulonimbus incus
Cumulonimbus cloud, cumulonimbus calvus.Nube cumulonimbus, calvus cumulonimbus.
Arcus cloud (shelf cloud) leading a thunderstorm
A cap (pileus) atop a congestus
The perfect thunderstorm as observed from C130 research aircraft during Project Cement #1.
Mammatocumulus with drooping pouches

This short article about science can be made longer. You can help Wikipedia by adding to it.