Abstract
Abstract A diagnostic analysis of the Presidents' Day storm of February 1979 is used to extend and quantify earlier findings of Bosart. The initial growth of cyclonic vorticity in the lower troposphere is driven primarily by convergence along the Carolina coastal front. Rapid cyclone spinup accompanies the approach of a potent midtropospheric short wave trough from the Ohio Valley. An analysis of the vorticity structure discloses that cyclone spinup is enhanced by the~vertical advection of vorticity in the strongly cyclonic in situ vorticity environment along the coast as the upper level trough overspreads the region. Similarly, a downward extension of high semige-strophic potential vorticity air accompanies a tropopause fold to the west of thecyclone and prior to the rapid cyclogenesis stage, confirming a result of Uccellini and others. Semigeostrophic potential vorticity is poorly conserved, however, and there is evidence for a separate region of semigeostrophic potential vorticity growth below 800 mb n...
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