The role of convectively generated rear-inflow jets in the evolution of long-lived mesoconvective systems

Rear-inflow jets are generated within these systems in response to the upshear-tilting of the convective circulation, as the horizontal buoyancy gradients along the back edge of the expanding system create a circulation that draws midlevel air in from the rear. In general, for environments characterized by weak-to-moderate vertical wind shear and weak-to moderate CAPE (convective available potential energy) the rear-inflow jet descends and spreads along the surface well behind the leading edge of the gust front, and the subsequent convective activity becomes weaker. However, for environments characterized by strong environmental vertical wind shear and strong CAPE, the rear inflow remains elevated to near the leading edge of the system, and strong, upright convective cells are maintained along the gust front. -from Author