The ultimate growth of a cumulus cloud into an anvil-shaped cloud with considerable vertical development, usually with fibrous ice crystal tops, and usually accompanied by lightning, thunder, hail, an [..]

1887, from cumulo-, comb. form of cumulus, + nimbus.

An exceptionally dense and vertically developed cloud, often with a top in the shape of an anvil. The cloud is frequently accompanied by heavy showers, lightning, thunder, and sometimes hail. It is also known as a thunderstorm cloud.

low-level cloud that produces rain, thunder, and lightning. Also called a thunderhead.

A heavy dense cloud with considerable vertical extent in the form of massive towers. 

(n) a dark cloud of great vertical extent charged with electricity; associated with thunderstorms

A principal cloud type, dense and vertically developed, which produces heavy precipitation. It features an anvil shape on top and a dark base. CUMULUS: A principal cloud type of vertical elements havi [..]

sometimes called thundercloud. The largest single cloud in the sky and can have a base of 2000 feet and tops of 40000 feet in temperate latitudes and even larger in the tropics.

A cloud type that is dense and vertically developed and is associated with rain (particularly of a convective nature). It is heavy and dense with a flat base and a high, fluffy outline, and can be tal [..]

An exceptionally dense cloud of great vertical development, occurring either as an isolated cloud or one of a line or wall of clouds with separated upper portions. These clouds appear as mountains or [..]

A cumuliform cloud type; it is heavy and dense, with considerable vertical extent in the form of massive towers; often with tops in the shape of an anvil or massive plume; under the base of cumulonimb [..]

Convective cloud meaning accumulated cloud, where nimbus means rain and cumulus means convective. This cloud has a flat cloud bottom with great vertical growth and can extend up to 13 miles. The flat base of the cloud signifies the Lifting Condensation Level (LCL) or the level of the atmosphere of equal temperature and dewpoint temperature. When th [..]

(Cb) Latin cumulus - to heap, nimbus - violent rain Commonly known as thunderstorms. These clouds can produce heavy rain, hail, strong winds and lightning. Several variations of the cumulonimbus are the incus (anvil), which has a well-formed anvil of cirriform cloud. Calvus (bald), which lacks the anvil. Often this is when the storm is still in the [..]

, Cumulonimbus cloud, characterized by strong vertical development in the form of mountains or huge tower stopped at least partially by a smooth, flat, often fibrous anvil. Also known colloquially as [..]

A cumulus type of deep vertical extent, often reaching in excess of 30000ft. The depth of cloud inevitably generates a heavy shower (sometimes of hail), which often is accompanied by thunder and light [..]

A vertically developed cumulus cloud, often capped by an anvil shaped cloud. Also called a thunderstorm cloud, it is frequently accompanied by heavy showers, lightning, thunder, and sometimes hail or gusty winds.

A type of cloud, also called a "thunderhead." These clouds often resemble a blacksmith's anvil as the top of the cloud generally extends in a smooth plane outward from the center of [..]

A vertically developed cumulus cloud, often capped by an anvil-shaped cirriform cloud. Also called a thunderstorm cloud, it is frequently accompanied by heavy showers, lightning, thunder, and sometime [..]

A vertically developed cumulus cloud, often capped by an anvil-shaped cirriform cloud. Also called a thunderstorm cloud, it is frequently accompanied by heavy showers, lightning, thunder, and sometime [..]

A vertically developed cumulus

A vertically developed cumulus cloud, often capped by an anvil-shaped cirriform cloud. Also called a thunderstorm cloud, it is frequently accompanied by heavy showers, lightning, thunder, and sometimes hail, tornadoes or strong, gusty winds.