USAGE RIGHTS

The above image, generated by @medro-martin is available for unrestricted use under a CC by 4.0 License.

BRIEF DESCRIPTION

Cumulonimbus (from Latin cumulus, "heaped" and nimbus, "rainstorm") is a dense, towering vertical cloud, forming from water vapor carried by powerful upward air currents. If observed during a storm, these clouds may be referred to as thunderheads.

References (for the description)

• https://en.wikipedia.org/wiki/Cumulonimbus_cloud