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vorticity into discrete, like-signed vortices. Smart and Browning (2009) used a high-resolution model simulation to investigate misocyclones in a tornadic NCFR over northern England, from which they inferred the occurrence of vortex-sheet rollup. In this and other observed cases (e.g., Carbone 1983 ), misocyclones and associated tornadoes occurred in mature NCFRs, which did not appear to exhibit any obvious intensification prior to tornadogenesis. However, the onset of HSI as a mechanism for the
vorticity into discrete, like-signed vortices. Smart and Browning (2009) used a high-resolution model simulation to investigate misocyclones in a tornadic NCFR over northern England, from which they inferred the occurrence of vortex-sheet rollup. In this and other observed cases (e.g., Carbone 1983 ), misocyclones and associated tornadoes occurred in mature NCFRs, which did not appear to exhibit any obvious intensification prior to tornadogenesis. However, the onset of HSI as a mechanism for the
