Since I was inspired by this tornado thread Link, I decided to modify this tool that I've made that I used to do other stuff except for twisters and tornados, I did used it for since crowds of birds and butterflies to flows of dust and ash, it uses any curve to flow particles through it and it interacts dynamically with fields, forces and collisions I just added a function to twist the particles through the curve to make a tornado like effect, since it is done in POP's it's very flexible and con