Cyclone

A vortex read through the skin of a ball. Two fbm fields build a slowly drifting warp, then the ball's own coordinate is spun by an angle that decays as a gaussian in the radius — tight at the eye, almost still at the limb — plus a constant rate, so the disc shears rather than turning. A five-octave fbm read in that spun frame, nudged sideways by the warp, ramps through four palette stops before a key light, a fill and the limb roll-off close it.