Mammatus Clouds
It is a cellular pattern of pouches suspended underneath the base of a cloud that is called Mammatus. They have the appearance of udders, so they are often referred to as mammary clouds. In contrast to the puffs of clouds that rise as a result of the convection of warm air, the characteristic “lumpy” undersides of clouds are generated by cold air sinking down to form the pockets, rather than warm air rising to form the pockets.
Mammatus Clouds
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