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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.
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 pileus (WMO genus and accessory cloud) – capped, hood-shaped cloud above a cumulonimbus cloud. Cumulonimbus praecipitatio (WMO genus and supplementary feature) – Cb whose precipitation reaches the ground. Cumulonimbus tuba (WMO genus and supplementary feature) – column hanging from the bottom of cumulonimbus. Debris cloud ...
From towering cumulonimbus clouds that signal severe thunderstorms to the eerie, pouch-like mammatus clouds often associated with turbulent weather, each cloud formation carries unique information.
The only cumulonimbus clouds that could be usable by a glider pilot, subject to all necessary reservations, might be isolated small cumulonimbus or at a pinch the flanking lines associated with strong thunderstorms. However, examples above show that a seemingly innocuous cloud can rapidly become very dangerous.
A precipitation shaft is mostly found underneath convective clouds, such as cumulonimbus cloud or cumulus congestus cloud during a downpour storm, as these have well defined vertical drafts (updrafts and downdrafts) needed for heavy precipitation.
Cloud suck is a phenomenon commonly known in paragliding, hang gliding, and sailplane flying where pilots experience significant lift due to a thermal under the base of cumulus clouds, especially towering cumulus and cumulonimbus.
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