Definition
A thundercloud is simply a cloud that produces thunderstorms. Often it refers to a cumulonimbus cloud, but it can also describe other cloud types associated with thunder and lightning. Think of it as any cloud that's ready to rumble. It's a cloud packing an electrical punch. These clouds are often dark and ominous-looking. They represent a potential for severe weather and danger. The term 'thundercloud' is a general term. It refers to any cloud that creates thunder.