Do you still remember all the different types of clouds? Well, there’s another category of clouds on the horizon, and these turbulent seas in the sky could be examples of the first official new cloud type since 1951.

Gavin Pretor-Pinney, founder of the Cloud Appreciation Society, said he began getting photographs of “dramatic” and “weird” clouds (including the above) four years ago that he didn’t know how to classify.

The Altocumulus cloud (Pretor-Pinney jokingly calls it the Jacques Cousteau cloud) would be classified as “asperatus,” which is Latin for “roughened up,” making it officially Altocumulus asperatus.

Check out some of the images below:

[Photograph courtesy Jane Wiggins via National Geographic]