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The Tropical Cyclone Extended Best Track

Dataset – Updates

  • January 2, 2020: The Atlantic and East Pacific Dataset files have been updated with data from 2018.
  • August 13, 2018: The Atlantic and East Pacific Dataset files have been updated with data from 2017.
  • January 22, 2018: The Atlantic and East Pacific Dataset files have been updated with data from 2016.
  • July 27, 2016: The Atlantic dataset file, which includes data from 1988 to 2015, has been updated with several corrections. The updated Atlantic file is available on this page in the Dataset Files section below.
  • July 5, 2016: The Atlantic and East Pacific Dataset files have been updated with data from 2015. Any CP portion of 2015 EP TCs are from the working Best Track.
  • August 6, 2015: 2014 Atlantic storm cases added.
  • September 10, 2014: 2013 Atlantic and East Pacific storm cases added.
  • February 22, 2013: 2012 Atlantic and East Pacific storm cases added. Note: many of the structure parameters in this file are from the new version of the official NHC HURDAT file, which is available here.
  • August 31, 2012: Correction: The missing 50 kt wind radii have been added to the 2010-2011 Atlantic cases.
  • August 16, 2012: The 2011 Atlantic and East Pacific storm cases have been added. A new distance-to-nearest major landmass field has also been added.

The National Hurricane Center (NHC) maintains a climatology of all Atlantic tropical cyclones since 1851, called HURDAT. For each storm, HURDAT contains estimates of the latitude, longitude, 1-minute maximum sustained surface winds, minimum sea-level pressure, and an indicator of whether the system was purely tropical, subtropical or extra-tropical at 6-hour intervals. A limitation of HURDAT is its lack of any information about storm structure. The “extended” best track file was created by supplementing HURDAT with additional storm parameters determined by NHC. The additional parameters include the following:

  • 1. Maximum radial extent of 34, 50 and 64 kt wind in four quadrants
  • 2. Radius of maximum wind
  • 3. Eye diameter (if available)
  • 4. Pressure and radius of the outer closed isobar



Extended Best Track Dataset Files

These datasets were designed for easy importation into spreadsheets. The original development of the Extended Best Track datasets was supported by the Risk Prediction Initiative in Bermuda and continued support is provided by the NESDIS Center for Satellite Applications and Research (StAR). The dataset files below are routinely updated with data from the previous year between February and March, after NHC finalizes the best track data. The additional wind structure parameters are estimated in real time during the NHC forecast process. Starting in 2003 the National Hurricane Center produces post-storm best track estimates of the wind radii. The Extended Best Track includes best track radii from 2003 and later and operational radii estimates from 2003 and earlier.

Left click links below to display files in your browser window.

Right click links below, click “save as” to download the files.

Extended Best Track Dataset Files (01/02/2020)

Extended Best Track Dataset Documentation Files (01/02/2020)

This documentation file describes the format and units of the datasets.




A sample wind swath product based on wind radii estimates from the National Hurricane Center in Miami.



Extended Best Track References

  • Demuth, J., M. DeMaria, and J.A. Knaff, 2006: Improvement of advanced microwave sounder unit tropical cyclone intensity and size estimation algorithms. J. Appl. Meteor., 45, 1573-1581.


Project Team Members

  • Mark DeMaria (NOAA/NESDIS)

  • John Knaff (NOAA/NESDIS)

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