This research was supported under National Science Foundation (NSF) Grant ATM-9400208 from the Physical Meteorology Program, Division of Atmospheric Sciences. Contributions to and critical reviews of this work were made by Drs. William Beasley of the University of Oklahoma and Craig Bohren of The Pennsylvania State University. The author wishes to thank Erik Rasmussen and Jerry Straka for allowing me to pursue this research in conjunction with project VORTEX and Todd Crawford for his careful examination of this manuscript. Much of the vehicle support for VORTEX was provided by the Center for Analysis and Prediction of Storms under NSF Grant ATM-9120009. Additional vehicle support and guidance were provided by the National Severe Storms Laboratory in Norman, Oklahoma.
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