We thank NHC for providing data for this study and Chris Landsea (NHC), Jack Beven (NHC), and John Knaff (CIRA) for providing feedback on the results. Two anonymous reviews helped clarify some portions of this work. This work is sponsored by the NOAA Hurricane Forecast Improvement Project (HFIP).
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Beginning in 2010, NHC adopted a Knaff–Zehr–Courtney pressure–wind relationship (Knaff and Zehr 2007; Courtney and Knaff 2009) to determine the minimum SLP based on the maximum wind speed. As a consequence, there can be large differences in this pressure–wind relationship compared to previous Dvorak-based estimates.
The nonzero difference at 0 h is due to the difference between the advisory and best-track positions.