The authors would like to thank Wayne Schubert, Paul Reasor, Michael Montgomery, Frank Marks, Hugh Willoughby, William Gray, Peter Black, Ricardo Prieto, Mark DeMaria, and David Nolan for their assistance and helpful comments. Ricardo Prieto generously provided the passive tracer code used in section 2c. We are grateful to the flight crews and scientists from NOAA’s Aircraft Operations Center, the Hurricane Research Division, and the Air Force 53rd Weather Reconaissance Squadron for their dedicated efforts of the past two decades to collect the flight-level data used in this study. We would also like to thank Hugh Willoughby, Ed Rahn, and Chris Landsea of the Hurricane Research Division for their efforts in making the data available to us. This work was supported by NSF Grant ATM-9729970, NOAA Grant NA67RJ0152 (Amendment 19), and NSF Grant ATM-9616818.
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