Recent studies have shown a strong connection between intrusion events in the tropical upper troposphere in the Eastern Pacific and the development of convection. One hypothesis for this connection is that the positive potential vorticity (PV) anomaly in the intrusion induces a region of reduced static stability at its leading edge, which favors the development of convection. Here, we examine this hypothesis by using "PV inversion" to determine the motion attributable to upper tropospheric PV tongues. The vertical motion as well as the low-level advection attributable to a PV tongue is calculated, and we examine the dependence on the latitude and spatial structure of the tongues.