View at EarthSky Community Photos. | Asperitas clouds, caught on June 10, 2019, by Kent Reinhard in Bennet, Nebraska. The World Meteorological Organization officially recognized this type of cloud in the 2017 version of its International Cloud Atlas. It was the first new addition to the Atlas in over half a century. See more asperitas clouds, and learn how they came to be Earth’s newest officially recognized cloud.
Source:
https://earthsky.org/todays-image/asperitas-clouds-ahead-of-the-rain