The authors thank the staff of the Weather Detachment at Luke Air Force Base for taking the upper-air soundings during the summer of 1993. Dr. David Rust discussed the results of the Colorado lightning modification field experiments with author RM and provided reprints of relevant papers. Mr. Ken Cummins of GAI provided copies of their high-quality lightning strike database for us to use. The comments and suggestions of three anonymous reviewers helped us to make substantial improvements in the presentation of this work.
Kurt Hondl and other group members of the NSSL Storm Research and Analysis Division (SRAD) helped us to use and apply the rads system during this work. Clinton Wallace and J. J. Gourley processed data and prepared several of the figures. Portions of the research reported here have been supported by the Salt River Project and the Electric Power Research Institute. Mr. Mark Fresch of the NWS OSF in Norman, Oklahoma, assisted in postprocessing data from the WSR-88D. The continuing support of SRP and interactions with Dan Phillips, Jon Skindlov, and other staff of the Water Resource Operations group, with the staff of the NWS Forecast Office at Phoenix, have made this work possible.
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