What exactly is turbulence and why is it bumpy. Why isn’t it one gust of wind that you feel. Was just on the plan and it felt like we were flying over rocks. Air travel is insane and very interesting.
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In a turbulent stream the speed of air changes rapidly in space and time, as it consists of “vortexes” of multiple scale. Air in these vortexes hits your plane from different directions, so for you it feels like a bumpy ride.
As an example of how a turbulent flow *may* look like, see pictures of [Kelvin-Helmholtz instability](https://en.wikipedia.org/wiki/Kelvin%E2%80%93Helmholtz_instability).
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