TIL that Asperitas clouds create dramatic, wave-like structures in the sky. These rare and striking clouds have an undulating, rough appearance and were only recently classified in 2017. They often appear after thunderstorms and look like a turbulent sea viewed from below.
https://en.wikipedia.org/wiki/Asperitas_(cloud)
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https://www.reddit.com/r/todayilearned/comments/1e8pygn/til_that_asperitas_clouds_create_dramatic/