In fluid dynamics, a von Kármán vortex sheet is a repeating pattern of swirling vortices caused by an unsteady separation of flow around blunt bodies. The flow of atmospheric air over obstacles such as isolated mountains can cause these vortices to form. Clouds present at the appropriate altitude allow for satellite visualization of the sheets.
Tall buildings must be constructed with downstream longitudinal fins to prevent the eddies from interacting to form vortices. This phenomenom is also responsible for the “singing” of telephone/power lines.
Source: http://www.bbc.co.uk/programmes/p00gbfn2 (BBC)
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