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Asperitas clouds wowed residents of Santa Cruz, California, on Tuesday, July 21.

The rare cloud formation is recognized by "well-defined, wave-like structures," according to the International Cloud Atlas.

Footage filmed by Kirsten Liske shows the asperitas clouds hovering over Santa Cruz on Tuesday.

"Watch this amazing cloud show," Liske says. "I've never seen anything like this before, and I look at clouds a lot. What is happening right now?" Credit: Kirsten Liske via Storyful