Kelvin-Helmholtz instability creates beautiful wave-like cloud patterns in the sky, or billow clouds. Different layers of the atmosphere can have different densities with air moving at different ...

Rare clouds could be seen from parts of the Highlands on Saturday afternoon. Called Kelvin Helmholtz, they resemble rolling ocean waves and similar patterns have been seen by astronomers on ...

Gorgeous examples of these wave clouds were photographed in Wyoming’s Bighorn mountains in December 2022, and in Breckenridge, Colo., in 2015. Read more about Kelvin-Helmholtz wave clouds Surf ...