.This is my second model posted. If you want a very high deff tornado then click on the domain of the tornado(the box that is around the tornado and right click it.) after you click on the domain of the tornado, look to the right of the screen and where you see," smoke high resolution." press, "show high resolution." Then go down to where it says, "Smoke cache." left click on the freebake button. Change the divisions up to whatever your computer can handle and then press bake under, "Smoke cache."