Storm over downtown Tulsa, Oklahoma. Amazing capture! Please pray for all the people in Oklahoma today that had massive destruction in Moore, OK. due to tornado. I have family there & haven't heard from them.
Kelvin-Helmholtz Wave clouds (also called billow clouds) form an almost uniform line across the sky, and take the visual form of a breaking wave. This behavior is caused by wind shear when two vertically adjacent layers of air are moving at different speeds.