Localized vorticity enhancement through superhelical coherent structure in observed tornadic supercells

TL;DR

This paper introduces new diagnostic methods based on superhelicity to detect and analyze localized vorticity enhancements in tornadic supercells, potentially improving early detection and understanding of tornadogenesis.

Contribution

The paper presents novel diagnostic techniques utilizing superhelicity for identifying and tracking coherent vortex structures in tornadic environments, offering earlier detection than traditional vorticity tendency analysis.

Findings

Superhelicity-based methods can detect signals of imminent tornadogenesis.

These methods improve early detection of tornadic features.

Insights into vortex interactions near mesocyclones are gained.

Abstract

New diagnostic methods are presented for localized, barotropic vorticity evolution in tornadic environments. These methods focus on superhelicity, a quantity shown to be strongly related to local maxima in vorticity tendency. Mobile Doppler radar retrievals from three well-known cases of tornadogenesis were studied with this new approach. The results show promise for detecting and tracking coherent dynamical features known to be related to tornadogenesis, as well as detecting signals of imminent tornadogenesis at an earlier stage than vorticity tendency analysis. Furthermore, these methods may provide physical insight into vortex-vortex interactions and vortex modes in the vicinity of the mesocyclone.