Cb cal

Cumulonimbus calvus
species of Cumulonimbus

Cumulonimbus in which the sproutings of the upper part are more or less indistinct and flattened and have the appearance of a whitish mass without sharp outlines. No fibrous or striated parts are visible. Cumulonimbus calvus usually releases precipitation; when the latter reaches the ground, it is in the form of showers.