Hugh E. Willoughby, director of the Hurricane Research Division, generously provided the HRD flight-level data archive. Appreciation is also extended to James L. Franklin of the Tropical Prediction Center for sharing his calculations of flight-level reduction factors. Bret Whissel contributed invaluable computer programming expertise, for which we are deeply grateful. Very constructive reviews came from Dr. Chris Landsea and another anonymous reviewer. This work was partially supported by Contract 1338- 847-41 from Florida International University.
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