A shot of the rare <a href="https://en.wikipedia.org/wiki/Kelvin%E2%80%93Helmholtz_instability" class="extiw" title="w:Kelvin–Helmholtz instability">Kelvin-Helmholtz waves</a> in cirrus clouds. Taken over the Pacific near Santa Cruz in California.
<a href="//commons.wikimedia.org/wiki/User:Astronautilus" title="User:Astronautilus">Astronautilus</a>
CC BY 2.0
<span class="int-own-work" lang="en">Own work</span>