However, you can only achieve so during favourable wind conditions and thermal wind factors largely play a part. (bali-indonesia.com)
As it is, a Hadley cell that conserves angular momentum develops large wind shears and the flow becomes baroclinically unstable (it can be shown through the so - called thermal wind equation that the vertical gradient of the horizontal wind velocity is proportional to the horizontal temperature gradient). (realclimate.org)
back to the horizontal gradient, if the upper tropospheric thermal wind shear increase is greater than the decrease of the lower layer, then maybe the overall baroclinic instability would be stronger — but currently the upper level eddy circulations do not transport much heat poleward, so would the structure of cyclones change so that a deeper layer of air is involved in the thermal advection, compensating for a weaker temperature gradient? (realclimate.org)