Found an interesting looking tornado. Looking like few meshes with displacement, simple clouds for texture, but I can’t understand how billowing effect is made. https://youtu.be/6xLxtlWoZkw?t=33
How this movement from inside to outside, where new blobs appearing and disappearing, not just moving to direction as if would be with simple panner.
I do think it’s a simple panner. Maybe there is another layer of a semi transparent mesh layered on top.
Take a look at this article, it shows a similar technique:
If in doubt you can always buy the pack on the marketplace and take a look at it 
Infinity Weather in Blueprints - UE Marketplace (unrealengine.com)
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