World’s Strangest

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14 Gorgeous Kelv-Helmz Cloud Formations

Kelv-Helmz is short for the Kelvin–Helmholtz instability (after Lord Kelvin and Hermann von Helmholtz). These tremendous cloud formations are the result of shearing winds up at the cloud level. A particular type of turbulence can develop in a layer of cirrus cloud, which forms below an inversion between air currents of differing speeds and/or directions. [...]

Kelvin-Helmholtz Wave Clouds

Redditor alison_bee photographed these bizarre clouds over Birmingham, Alabama. I planned to go with the end of the world as an explanation, but another redditor, claiming to be a meteorologist, explains what’s happening in more scientific terms: What is happening is that the nocturnal near-surface layers (lowest 50-100m) of the atmosphere are much more stable than [...]