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Aviation Glossary :: Cumulonimbus  Aviation Glossary :: Cumulonimbus FAA Written Test Preparation
Aviation Glossary Welcome to the Dauntless Aviation Glossary!

At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including our FAA written test prep and FAA practical test prep software and apps. If you like this glossary, you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).

Cumulonimbus
Cumulonimbus
A cumuliform cloud·type; it is heavy and dense, with considerable vertical extent in the form of 204 massive towers; often with tops in the shape of an anvil or massive plume; under the base of cumulonimbus, which often is very dark, there frequently exists virga, precipitation and low ragged clouds (scud), either merged with it or not; frequently accompanied by lightning, thunder, and sometimes hail; occasionally produces a tornado or a waterspout; the ultimate manifestation of the growth of a cumulus cloud, occasionally extending well into the stratosphere.
source: FAA Aviation Weather for Pilots (AC 00-6A)
Also called thunderclouds, these are deep convective clouds with a cirrus anvil and may contain any of the characteristics of a thunderstorm: thunder, lightning, heavy rain, hail, strong winds, turbulence, and even tornadoes.
source: FAA Glider Flying Handbook (FAA-H-8083-13A)
CB: a type of cloud characterised by its density, large size and height, its tendency to create stormy conditions and the hazard it represents for aircraft. It often has a characteristic ‘anvil’ shape
source: ICAO English Pro Aviation Glossary

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