Cumulonimbus calvus
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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 cumulonimbu
Cumulonimbus calvus, with probable cumulonimbus incus in background over Milan Malpensa Airport, Milan, Italy
A Cumulonimbus Calvus over Lake Leaghur, Mungo, viewed from Lake Mungo at 4 Oct 2024. A rain shaft can be seen in the photo, falling down from the cloud.
Cumulonimbus incus
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A cumulonimbus incus cloud, also called a thunderhead or anvil cloud, is a cumulonimbus cloud that has reached the level of stratospheric stability and has formed the characteristic flat, anvil-shaped
Cumulonimbus calvus
…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…
A cumulonimbus incus cloud, showing the characteristic anvil-top shape the cloud type displays
Cumulonimbus incus over Africa, seen from the International Space Station