A new model developed at Goddard points to gravity waves in Jupiter’s atmosphere as the cause, and we might have a similar mechanism on Earth.
Source: NASA: Gravity Waves Are Responsible for Jupiter’s Jet Stream Flip-Flops – ExtremeTech
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Just remember that this is “gravity waves” in the fluid-dynamics sense, not in the relativistic sense.
https://en.wikipedia.org/wiki/Gravity_wave