clouds

Cumulonimbus clouds indicate impending precipitation (hence 'nimbus'), as they are most closely associated with thunderstorms and can forecast severe weather.

cloud

a cumulonimbus cloud's name comes from the Latin roots: “cumulus” = “towering” and “nimbus” = “rain.”

cumulus clouds

Wikipedia Cumulonimbus resemble the cumulus clouds from which they grow, except they rise into towers with bulging upper portions that look like cauliflower.

towering clouds

Most thunderstorms are associated with towering clouds known as cumulonimbus.

thunderstorm clouds, heavy and dense, in the form of a mountain or huge tower

Cumulonimbus are thunderstorm clouds, heavy and dense, in the form of a mountain or huge tower.

associated with thunderstorm cloud

A cumulonimbus, or thunderstorm cloud, has charges or energy associated with thunderstorm cloud.

heaped towering rain-bearing clouds

Cumulonimbus (WMO genus) – heaped towering rain-bearing clouds that stretch to the upper levels of the troposphere.

a low cloud

(v) Cumulonimbus is a low cloud.

low-level clouds

Cumulonimbus are heavy and dense low-level clouds, extending high into the sky in towers, plumes or mountain shaped peaks.

the thunderstorm clouds whose base is near the ground but which rise through the sky, forming distinctive anvil-heads

Cumulonimbus are the thunderstorm clouds whose base is near the ground but which rise through the sky, forming distinctive anvil-heads.

cloud type

The meteorologically assigned cloud type associated with the thunderstorm is the cumulonimbus.

a dark gray feminine cloud

Cumulonimbus is a dark gray feminine cloud with a British accent and Cirrus is a light gray feminine one with a French accent.

rainy puffy clouds (*cough* thunderhead)

Cumulonimbus means rainy puffy clouds (*cough* thunderhead).

a rain cloud that has a 'piled' appearance

A cumulonimbus is a rain cloud that has a 'piled' appearance, as opposed to a stratus, or 'flat' cloud.

the main rain clouds which are black

Cumulonimbus are the main rain clouds which are black.

to rain clouds and hints at the thematic material of the piece

The name “Cumulonimbus” refers to rain clouds and hints at the thematic material of the piece.

in English as storm clouds

Cumulonimbus are known in English as storm clouds and these are extremely unpredictable with the ability to produce lightning, hail, gale force winds and even tornadoes.

these storms , known as cumulonimbus,

The clouds that comprise these storms, known as cumulonimbus, are in my view the most exciting that Mother Nature has to offer.

a cluster of cumulus clouds

Cumulonimbus begins as a cluster of cumulus clouds which build up and form rain clouds, expect a thunderstorm.

thunder , violent downpours, maybe even a tornado

Cumulonimbus – the cloud that everyone fears – portends thunder, lightning, violent downpours, maybe even a tornado.