One idea would be to use POV-Ray's BOXED pattern-- with a pigment_map composed
of *multiple* (averaged?) SPIRAL patterns inside it, each with some appropriate
colors and warp{turbulence...}-- as a way to apply separate 'decals' to various
places on the already-textured planet surface. (The 'outside' of the BOXED
pattern(s) could fade to transparency, so as not to look like the storms are
simply stuck on.) The idea is certainly not as 'realistic' as true fluid
dynamics, but it might work.

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