In addition, the
equatorward propagation of energy set up in July in the strong wave years is so powerful that energy continues to
propagate towards the equator through October, as shown in the first diagram.
The transition to superrotation occurs under conditions in which
equatorward propagating Rossby waves generated by baroclinic instability at intermediate and high latitudes are suppressed, which will occur when the deformation radius exceeds the planetary radius.