We look at the sky in human time. It looks still.
The sky actually operates on its own slower clock. It is best seen in time lapse.
I like this particular movie because what looks flat in real time is very complex when sped up. It’s one of the reasons weather modeling so often fails. We can’t model this complexity.
Even the best computer models only resolve to a few kilometers. What you’re seeing is going on in feet and inches. It’s turbulent up there.
The atmosphere is the most complex thing on Earth.