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WMO Format Parameters best tracked by the NHC

WMO Format Parameters best tracked by the NHC. a The NHC receives multiple Dvorak estimates which are archived in the ATCF fix file instead of the best track file.

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WMO Format Parameters best tracked by the NHC

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  1. WMO Format Parameters best tracked by the NHC a The NHC receives multiple Dvorak estimates which are archived in the ATCF fix file instead of the best track file. b The NHC real-time wind gusts RMWs, ROCIs, POCIs, and storm depths are included in the ATCF and/or Extended HURDAT best track files. These data have not been properly post-analyzed. c The NHC best tracks three wind radii – 34 kt, 50 kt, and 64 kt - by quadrants.

  2. NHC Best Track/WMO Format Issues • NHC Best Track data is spread through three file types – the official HURDAT, the ATCF format, and the Extended HURDAT. • The HURDAT format will be phased out in favor of the ATCF format. • Many NHC best-tracked parameters are similar to the WMO parameters, but are expressed with different standards or codes. The most notable differences are for the cyclone type parameter. • WMO format quality control codes could be added to the ATCF best track files without (hopefully) significantly increasing the NHC best track work load. However, this would require major changes in the ATCF formats and software that will take time. • NHC best track winds and pressure often differ significantly from the Dvorak intensity estimates, which is why Dvorak data is not part of the best track files.

  3. NHC Best Track/WMO Format Issues • The NHC currently feels there is not enough accuracy or precision in RMWs, POCIs, and ROCIs to justify the workload required to best track them. • The WMO format lacks the ability to best track three wind radii. • The WMO and ATCF formats lack the ability to best track the concentric eyewalls/RMWs that are often observed. • The ATCF format has entries for storm motion, eye diameter, and sea heights that are currently not used formally by the NHC.

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