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.
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From Wikimedia Commons, the free media repository. English: Cumulonimbus calvus is a moderately tall cumulonimbus cloud which is capable of precipitation , but has not yet reached the height where it forms into a 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 capillatus. Deutsch: Calvus cal bezeichnet eine Cumulonimbuswolke ohne Amboss. Die oberen Teile der Wolke sehen nirgends deutlich faserig aus, die Oberseite hat jedoch nicht mehr die Blumenkohlform vom Cumulus und keine scharfen Umrisse. Sadejuovat voivat olla tummia vaaleaa taustaa vasten tai vaaleita tummaa taustaa vasten. Nederlands: Calvus is een cognomen of agnomen , de betekenis is: "de kale".
Cumulonimbus and Supplementary Features
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.
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.