http://www.sciencemag.org/news/2020/05/aircraft-spies-gravity-waves-being-sucked-antarctica-s-polar-vortex

Lenticular clouds over the Andes’s Torres del Paine are a sign of gravity waves.

The Southern Ocean is famously stormy, home to waves taller than telephone poles. Yet 50 kilometers overhead, the weather is just as tempestuous, if less obviously so. Powerful waves in the air break and crash, dumping energy into the stratosphere and disrupting winds that help control the climate.