The Production of the Vertical Superposition of the Polar and Subtropical Jets during the May 2010 Nashville Flood
The present study adopts a piecewise potential vorticity (PV) perspective to investigate the dynamical mechanisms that conspired to produce the vertical superposition of the polar and subtropical jets during the May 2010 Nashville Flood. From this perspective, the analysis focuses on the life cycles of the originally separate jet structures. It is apparent that both internal jet dynamics and latent heat release from lower tropospheric convection over the southern Mississippi River Valley were essential in the formation of the superposed jet structure via diabatic as well as dynamic restructuring of the tropopause. In order to pinpoint the dominant mechanism fostering jet superposition, flow patterns associated with the polar and subtropical jets as well as latent heat release are isolated via the piecewise PV inversion.