noun. a dark cloud of great vertical extent charged with electricity; associated with thunderstorms.
- cumulonimbus cloud
- clear up
Sentences with cumulonimbus
1. Noun, singular or mass
As an example, rain-bearing cumulonimbus clouds often begin at below 6,000 feet and extend upward to altitudes above 20,000 feet.
A cumulus cloud becomes a cumulonimbus cloud capable of severe thunderstorms when sufficient heat, updraft and moisture combine in the cloud to produce lightning, thunder and heavy rains.