A Preliminary Study of Observed Azimuthal Shear Values for Severe Weather Reports
Matthew Mahalik, Univ. of Oklahoma/CIMMS and NOAA/NSSL, Norman, OK
Brandon Smith, Univ. of Oklahoma/CIMMS and NOAA/NSSL
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Abstract
Azimuthal shear (AzShear) is a radar-derived estimate of rotational strength that can be used to identify locations where mesocyclones and possibly tornadoes exist. Compared to rotational velocity and gate-to-gate shear measurements, it is mathematically more robust and meteorologically more representative of two-dimensional rotation in a Doppler velocity field. The goal of this study is to document typical values of AzShear over a wide variety of severe weather events during a 2-year period from 2014-2015 to develop a climatology of observed AzShear values for tornadic supercells, non-tornadic supercells, and non-supercell tornado events. The results will aid in providing a better understanding of the AzShear values themselves for use within the meteorological community.