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Cumulonimbus (from Latin cumulus 'swell' and nimbus 'cloud') is a dense, towering, vertical cloud, [1] typically forming from water vapor condensing in the lower troposphere that builds upward carried by powerful buoyant air currents.
Cumulonimbus mamma (WMO genus and supplementary feature) – Cb with pouch-like protrusions that hang from under anvil or cloud base. Cumulonimbus pannus (WMO genus and accessory cloud) – shredded sections attached to main Cb cloud. Cumulonimbus pileus (WMO genus and accessory cloud) – capped, hood-shaped cloud above a cumulonimbus cloud.
Cumulus congestus clouds compared against a cumulonimbus cloud in the background. Due to reflectivity, clouds cool the earth by around 12 °C (22 °F), an effect largely caused by stratocumulus clouds. However, at the same time, they heat the earth by around 7 °C (13 °F) by reflecting emitted radiation, an effect largely caused by cirrus clouds.
Cumulonimbus clouds. September 19, 2023: Cumulonimbus clouds rise behind wind turbines in Big Spring, Texas. Towering, dense clouds with a flat, anvil-shaped top.
A cumulonimbus incus (from Latin incus 'anvil'), also called an anvil cloud, is a cumulonimbus cloud that has reached the level of stratospheric stability and has formed the characteristic flat, anvil-shaped top. [1] It signifies a thunderstorm in its mature stage, succeeding the cumulonimbus calvus stage. [2]
This warm air is forced upward and generates cumuliform clouds when the air column becomes saturated. [2] These feeder clouds will merge with the main cumulonimbus and will regenerate the storm. These new feeder clouds are located, in the northern hemisphere, at the west or southwest of the main cloud. [3]
Larger cumulus clouds under the higher cloud types than at a warm front, where stratocumulus and cumulus humilis usually occur. Some of these cumulus clouds may produce showers ahead of the front. Cumulonimbus and cumulus congestus producing frequent showers, with a sheet of upper altostratus, through which the sun can sometimes be seen.
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