[Alternating eddies of vortex street.]

[The Canary Islands as an eddy-creating obstacle via GSFC/NASA.]

Vortex streets emerge when the right wind and cloud formation encounters the right kind of obstacle. Theodore von Kármán, a fluid dynamicist, observed and documented this phenomenon. Swirling rings sequence along a street-like corridor trail beyond the obstacle. Each ring stems from an air pockets are released in a series of vortices alternating parallel to wind direction. This condition can happen at any scale if the proportion of energies and obstacles is present.

[Another set of vortices southeast of the Ilha da Madeira (Madeira Island) via GSFC/NASA December 1, 2002.]

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