Cloud vortices

Cloud vortices are seen off Cheju Do, South Korea. When air flows around an object such as a mountain or island, turbulence results.

In this image, captured on March 2, 2011, by the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Terra satellite, the oval form of Mt. Halla can be seen presenting its broadest face perpendicular to the prevailing wind. A single s-shaped cloud formation trails delicately off the leeward side of the mountain and a von Karman vortex street decorates the clouds in a typical, paisley-like, pattern.

Picture: NASA