What is cumuloninmbus?

Answer 1

Cumulonimbus is a type of cloud, very dense and fluffy, sometimes pure white or they can be dark and grey, heavy rain and thunderstorms are usually associated with this cloud.

Answer 2

Cumulonimbus is a type of large, dense cloud that is associated with thunderstorms and severe weather. It is recognizable by its towering structure with a flat anvil-shaped top and can produce heavy rain, lightning, strong winds, and sometimes hail or tornadoes.