We are thankful for the help and comments of Stacy Brodzik, Greg Hakim, Deanna Hence, Wen-Chau Lee, Bradley Smull, Angeline Pendergrass, John M. Wallace, and Michael Bell. Dr. Bell provided the vortex centers and valuable guidance with radar data processing and interpretation. Comments from Gary Barnes, Ed Zipser, and an anonymous reviewer brought significant improvements to the manuscript. Beth Tully assisted with graphics and editing. This research was supported by the National Science Foundation under Grants ATM-0432623 and ATM-0743180 and the Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program.
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