  We analyze recent experiments at JILA which observe periodic formation of
stripes in a rotating Bose condensate [Engels et al. Phys. Rev. Lett. {\bf 89},
100403 (2002)], and explain this behavior as a consequence of kinetic energy
driven evolution, where the vortices follows a quadrupolar flow. We demonstrate
that the structure of vortex lattices in the lowest Landau level is a useful
tool for understanding such complex phenomena, even when the system is not in
the quantum Hall regime.
