Weatherwatch: vortex ‘streets’ that can flatten power stations

Kármán found that air flowing around an obstacle broke away into distinct whirlwinds – causing wires to sing or towers to wobble

A Kármán vortex street is a series of whirlwinds produced by a cylindrical object, such as a tower, in the wind. The stream of miniature tornadoes travels downwind of the obstacle at regular intervals, which is why the effect is known as a street. These little-known streets can destroy buildings.

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