fluid dynamics and the density variations between various strata of the atmosphere. and the fan does blow in gusts, if you looked at it in slow motion with so.e way to contrast fan blown air from ambient, you would see each blade pushing off density like it is cutting slices of butter from the intake before fluid dynamically coalescing/melting into a more culminated column of air/butter. The weather wind is just using the density variations in the atmosphere as thermal equilibrium is unsettled to chop up the butter slices, where Coriolis forces and regional pressure fluctuations attract them to equilibrium as gravity pulls the various densities into their proper rank and strata letting the butter melt and solidify equally but in proper stable order. hence the gravity wave term for weather systems.
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