One for engineering geeks

Never seen this effect at this scale before; Von Karman vortices formed in the clouds stretching hundreds of miles beyond two small islands off Chile. Hat tip to Milind on Linked In for sharing the link.

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Interesting not least (to a geek like me) because this is an effect that works at small and very small scales too – around towers and chimney stacks, around power distribution cables, around old aircraft struts and wires, even around tiny wires in instruments, where the effect is exploited to measure flow rate. (I often hear it at audible frequencies as the wind blows past the leg of my specs.)

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