Altocumulus asperitas
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Altocumulus asperitas

by Claudine Vanbauce, Université de Lille / Laboratoire d'Optique Atmosphérique, Lille, France

Asperitas is characterized by localized waves in the cloud base, either smooth or dappled with smaller features, sometimes descending into sharp points, as if viewing a roughened sea surface from below. (text from https://cloudatlas.wmo.int/clouds-supplementary-features-asperitas.html)