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Towering cumulonimbus clouds are typically accompanied by smaller cumulus clouds. The cumulonimbus base may extend several kilometres (miles) across, or be as small as several tens of metres (yards) across, and occupy low to upper altitudes within the troposphere - formed at altitude from approximately 200 to 4,000 m (700 to 10,000 ft).
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.
They form when cumulus congestus clouds develop a strong updraft that propels their tops higher and higher into the atmosphere until they reach the tropopause at 18,000 metres (59,000 ft) in altitude. Cumulonimbus clouds, commonly called thunderheads, can produce high winds, torrential rain, lightning, gust fronts, waterspouts, funnel clouds ...
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]
Towering vertical clouds have the greatest ability to produce intense precipitation events, but these tend to be localized unless organized along fast-moving cold fronts. Showers of moderate to heavy intensity can fall from cumulus congestus clouds. Cumulonimbus, the largest of all cloud genera, has the capacity to produce very heavy showers.
Cloud height is often related to the intensity of precipitation generated by a cloud: deeper clouds tend to produce more intense rainfall.For instance, cumulonimbus clouds can develop vertically through a substantial part of the troposphere and often result in thunderstorms with lightning and heavy showers.
Noctilucent clouds form at a very high altitude on the edge of space and are visible between the end of May and the start of August every year. Rare, high-altitude clouds amaze stargazers [Video ...
By definition of cumulonimbus cloud, at its top water droplets are transformed into ice crystals. But for cumulonimbus calvus, content of ice crystals are meager and polar are in early stage, so the cloud tops still look round and puffy. A Cumulonimbus Calvus over Lake Leaghur, Mungo, viewed from Lake Mungo at 4 Oct 2024.