Vortices in the Atmosphere Sustained only by PGF
Tornadoes, land/waterspouts and supercell thunderstorm mesocyclones are examples of vortices where Coriolis is unimportant.  Tornadoes are in cyclostrophic balance.  Land and waterspouts (as well as non-supercell tornadoes) arise from horizontal convergence of vertical vorticity.  The supercell mesocyclone spin originates as horizontal vorticity that is tilted and stretched into vertical vorticity.  These vorticies can spin in either direction in either hemisphere.