A New Cloud

These unusual and spectacular clouds are known as undulatus asperatus. Though they have been proposed as a new type of cloud, they are as yet officially unrecognized. Despite their dramatic appearance, these clouds are not associated with storms. Instead, they’re thought to form in a process similar to mammatus clouds, where wind shear at the cloud level causes undulations to form. This wave-like structure is especially visible in the photo above thanks to a low sun angle illuminating the underside of the clouds. (Image credit: W. Priester; via APOD)

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