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Cumulonimbus calvus

No other cloud type besides a cumulonimbus cloud can receive a calvus classification. The precursor to these clouds are usually cumulus congestus clouds, and can be differentiated through a darker base, thunder, lightning, precipitation, all of which are features of cumulonimbus clouds. Depending on the conditions, these clouds can morph from a cumulus congestus, to a cumulonimbus calvus, to a cumulonimbus capillatus incus thunderstorm with an anvil cloud within the matter of minutes. Other cloud features and accessories that might be associated with these clouds include pileus cap cloud , virga evaporating rain strips , and praecipitatio rainfall. On the rare occasion, a fire could assist with the formation of these clouds, which would give the cloud a classification of cumulonimbus calvus flammagenitus. Cumulonimbus calvus praecipitatio Cb cal pra. Cumulonimbus calvus virga Cb cal vir. Cumulonimbus calvus Cb cal. Calvus Cloud Types. The calvus cloud species is only associated with the cumulonimbus cloud type.
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Cumulonimbus where the sproutings of the upper parts are indistinct and flattened and have the appearance of a whitish mass without sharp outlines. No fibrous or striated parts are visible. Cumulonimbus calvus usually produces precipitation; when it reaches the ground, it is in the form of showers. Skip to main content. Toggle navigation. Introduction and principles of cloud classification Definition of a cloud Appearance of clouds Principles of cloud classification Cloud classification summary Cloud abbreviations and symbols. Useful concepts Definitions of clouds. Introduction Orographic influence on the windward side Orographic influence on the leeward side. Nacreous clouds Nitric acid and water polar stratospheric clouds Noctilucent clouds polar mesospheric clouds. Classification and symbols of meteors other than clouds Hydrometeors Lithometeors Photometeors Electrometeors Character and intensity of precipitation Additional symbols.
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Definition: A species of cumulonimbus cloud whose upper portion appears bald and cauliflower-like

If Cumulus congestus clouds the caulifower shaped ones continue to grow vertically, as their summits reach very high altitudes where the temperature is below o C, the water droplets in the cloud begin to freeze, giving a fibrous appearance, in contrast to the sharp-edged cumulus formations at lower levels. Cumulonimbus clouds can occur at any time of year in Wolstanton. Normally, they are associated with hot thundery weather in the summer, but they can equally well occur in the unstable polar maritime and artic air masses that follow the passage of cold fronts. In the example here, the only the tops of the cumulus clouds on the horizon have a fibrous appearance due to glaciation. Cumulonimbus clouds of this type are given the species name calvus ; latin for bald. The clouds here do not appear to have particularly great vertical extent here because the tropopause was low due to the pressence of a polar martime airmass and it being winter. Cumulonimbus capillatus incus over the Goyt Valley, Derbyshire, after the passage of a real April shower. When glaciation becomes more extensive and much of the upper section of the cloud has a fibrous appearance, the cloud is given the species name capillatus ; latin for long haired, reflecting the hairy streaks of ice crystal cloud at its top edges. Very often the supplementary feature incus anvil is also present. The anvil is caused by convected air being forced outward once it reaches the tropopause.
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Cumulonimbus calvus is a moderately tall cumulonimbus cloud that is capable of precipitation but has not yet reached the tropopause, which is the height of stratospheric stability at which cumulonimbus forms into cumulonimbus capillatus fibrous-top or cumulonimbus incus anvil-top. Cumulonimbus calvus develops from cumulus congestus , and its further development, under auspicious conditions, will result in cumulonimbus incus. This cloud consists mainly of water droplets.

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 cloud tops still look round and puffy.

Cumulonimbus calvus is characterized by distinctive between other types of cumulonimbus cloud rounded shape and relatively sharp edges of its top area, unlike cumulonimbus incus or cumulonimbus capillatus , which have cirriform tops. Developing cumulonimbus calvus lose sharp outlines of the top as more water droplets transform into ice crystals. Strong updrafts may form pileus or thin vertical stripes may protrude upwards out of the cloud.

When upper parts of the cloud freeze to a greater extent and clearly visible cirriforms appear, cumulonimbus calvus metamorphoses into another species of cumulonimbus. Cumulonimbus calvus arcus is a sub-form of cumulonimbus calvus, which has arcus cloud ahead of cloud's front. Like other cumulonimbus clouds, cumulonimbus calvus can cause severe weather conditions including:.

The cumulonimbus calvus can further grow larger if the updraft is strong. It can form into a cumulonimbus incus , and bring more severe thunderstorms that can cause constant cloud-to-ground lightning, extensive wind damage, microbursts , hail, and occasionally a tornado. From Wikipedia, the free encyclopedia. This article does not cite any sources. Please help improve this article by adding citations to reliable sources.

Unsourced material may be challenged and removed. Cumulonimbus calvus, with probable cumulonimbus incus in background over Milan Malpensa Airport , Milan , Italy. Cloud genera and selected species, supplementary features, and other airborne hydrometeors - WMO Latin terminology except where indicated.

Noctilucent Polar mesospheric clouds. Nitric acid and water polar stratospheric clouds. Cirrus intortus Ci in Cirrus vertebratus Ci ve. Cirrostratus fibratus Cs fib Cirrostratus nebulosus Cs neb. Homomutatus homut Contrail. Altostratus As. Nimbostratus Ns. Cumulonimbus calvus Cb cal Cumulonimbus capillatus Cb cap. Cumulonimbus cauda cau Tail cloud Cumulonimbus incus inc Cumulonimbus murus mur Wall cloud.

Cumulonimbus flumen Cb flu Beaver tail Overshooting top Hot tower. Stratus fractus St fra Stratus nebulosus St neb. Stratus silvagenitus St sil Fog. Arcus arc Shelf Tuba tub Funnel cloud. Pileus pil Velum vel Flammagenitus flgen Cataractagenitus cagen.

Accessory cloud Pannus pan Homogenitus hogen Actinoform cloud. Categories : Cumulus Atmospheric science stubs. Hidden categories: Articles lacking sources from December All articles lacking sources Commons category link is on Wikidata All stub articles.

Namespaces Article Talk. Views Read Edit View history. Help Community portal Recent changes Upload file. Download as PDF Printable version. Wikimedia Commons. Wikimedia Commons has media related to Cumulonimbus calvus. Very High-level km Nacreous clouds Nacreous.

Species Cirrostratus fibratus Cs fib Cirrostratus nebulosus Cs neb. Species Stratus fractus St fra Stratus nebulosus St neb. This cloud —related article is a stub. You can help Wikipedia by expanding it.

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