Multiple Cloud Vortices off Moroccan Coast – April 11th, 2009
Several cloud vortices can be seen swirling off the coast of Western Sahara and Morocco, south of the Canary Islands.
An interesting property of a vortex is that of merging. If two or more the vortices visible here are approximately parallel and circulating in the same direction, they will quickly merge to form a single vortex.
If this occurs, the circulation of the merged vortex will equal the sum of the circulations of the constituent vortices.