Session 14.2 Descending Reflectivity Cores in a simulated supercell

Thursday, 30 October 2008: 8:45 AM
North & Center Ballroom (Hilton DeSoto)
Leigh Orf, Central Michigan Univ., Mount Pleasant, MI; and M. S. Gilmore, J. M. Straka, R. B. Wilhelmson, L. J. Wicker, and E. N. Rasmussen

Presentation PDF (2.3 MB)

Descending Reflectivity Cores (DRCs) have been identified both in WSR-88D radar data and visually in the field. In this study, results are presented from high resolution (100 meter horizontal grid spacing) simulations of supercells which contain DRCs. Individual DRCs are examined using both Eulerian and Lagrangian techniques, including vortex core detection software to investigate whether there is a relationship between DRCs and vortexgenesis. Pressure decomposition analysis is applied to explore contributions towards vertical accelerations associated with DRCs. Reults thus far indicate one DRC is found adjacent to a developing tornado (see figure), while another is associated with a counterrotating shear signature during tornadogenesis. These DRCs are found to be associated with both buoyant and dynamic forcing within downdrafts in the supercell hook echo appendage.

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