The U.S. National Weather Service, opens new tab describes Undulatus Asperatus clouds as a rare cloud formation that appears dark and storm-like but tends to dissipate without a storm forming and ...

Quite a few Iowans spotted ominous, swirling cloud formations Thursday evening as storms moved through the state. These ...

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Skies in parts of B.C. were darkened on Friday by striking cloud formations known as asperitas, with social media getting lit ...