Noun
a dark cloud of great vertical extent charged with electricity; associated with thunderstorms
Source: WordNetA cumulonimbus cloud that appears to have a greenish/bluish tint is a sign that it contains extremely high amounts of water; hail or rain which scatter light in a way that gives the cloud a blue color. Source: Internet
A tuba feature is a cloud column that may hang from the bottom of a cumulus or cumulonimbus. Source: Internet
Cumulonimbus dissipating at dusk Cloud-based supplementary features Incus is the most type-specific supplementary feature, seen only with cumulonimbus of the species capillatus. Source: Internet
Low and vertical heaps of cumulus, towering cumulus, and cumulonimbus are made of larger water droplets ranging in radius from 0.005 to about 0.015 mm. Source: Internet
In the dissipating stage of a cumulonimbus cloud, when the normal column rising up to the anvil has evaporated or dissipated, the mat of cirrus in the anvil is all that is left. Source: Internet
Depending on the conditions present in the atmosphere, these three stages take an average of 30 minutes to go through. citation Stages of a cumulonimbus cloud's life. Source: Internet