Moderator Edit: DUDU.car is the winner of "'Tis for the GLORY #1". Honor him. 

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Here a quick test that I had carried out two years ago for a sequence of my film in progress.I had tested the particles, but the result wasn't very convincing then… I gave up !

I suppose that your tornado is in vertexes and that you animate the texture ?

For shure, the yours is nicely done !