The authors are thankful to Sidney A. Gauthreaux, Alexander Ryzhkov, and anonymous reviewers for their comments and suggestions that improved the presentation of the results. The research work was supported by the NOAA A8R2WRP project and FAA Contract IA#DTFA03-01-X-9007 to NSSL and by ONR Grants N000140310822 and N000140410312 to the University of Oklahoma.
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