As part of an ongoing effort to study polarimetric tornado precursor signatures, we examine these radar data sets to construct a catalog of high temporal resolution supercell ZDR columns. Following automated identification of each ZDR column, a set of characteristics (height, intensity, areal coverage, and longevity) are evaluated in order to quantitatively associate the effects of these properties on tornado formation or failure.
We will present our current catalog of rapid-scan polarimetric observations of ZDR columns, and invite additional contributions from the community. At the time of the conference, we will have examined cases from VORTEX2 along with PX-1000 and RaX-Pol data sets. Our long-term objectives are to enhance understanding of the dynamics and microphysics of potentially tornadic supercells, as well as identify possible tornado precursor signatures with operational utility.