The authors are thankful to Guoqing Ge of the University of Oklahoma (OU), Richard Doviak of NSSL, and anonymous reviewers for their comments and suggestions that improved the paper and to Kang Nai and Yuan Jiang of OU for their help in producing Figs. 2 and 7. The research was supported by ONR Grant N000141010778 to OU. Funding was also provided by NOAA/OAR under NOAA-OU Cooperative Agreement NA17RJ1227, U.S. Department of Commerce.
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