Wavy clouds were spotted in parts of New Hampshire on Sunday. The cloud formation, known as undulatus asperatus, was first ...

Chilling scenes continued before the storm in the sky as well. Undulatus Asperatus Clouds were formed, one of the rarest ...

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 ...

The clouds were originally referred to as "undulatus asperatus." The name roughly translates to "rough waves" in Latin.Asperitas became the cloud formation's formal name when it was officially ...