AOS Department Seminar - Prof. Matthew Hitchman

A variability index for potential vorticity (PV) near the top of convective complexes is used to study the evolution and diurnal cycle of tropical cyclone (TC) Yasa, which occurred near Fiji during 12-20 December 2020. Deep convective updrafts can transport air with different momentum into the upper troposphere / lower stratosphere (UTLS), yielding mesoscale jets, hence horizontal PV dipoles.