The GFDL vortex tracker system consists of the source code for the GFDL vortex tracker as well as the tracker utility.
The standalone Geophysical Fluid Dynamics Laboratory (GFDL) vortex tracker is a program that objectively analyzes forecast data to provide an estimate of the vortex center position (latitude and longitude), and track the storm for the duration of the forecast. Additionally, it reports metrics of the forecast storm, such as intensity (maximum 10-m winds and minimum mean sea level pressure (MSLP)), structure (wind radii for 34, 50 and 64 knot thresholds in each quadrant), radius of the outermost closed isobar (ROCI), and optionally integrated kinetic energy (IKE), storm surge damage potential (SDP) and cyclone thermodynamic phase at each output time.
The software can track either storms that exist at model initialization time or storms that develop during the forecast (cyclogenesis). The GFDL vortex tracker requires the forecast grids to be on a cylindrical equidistant, latitude-longitude (lat/lon) grid. Forecast files can be in GRIB (GRIB1 or GRIB2) or, starting with v3.9a, NetCDF format.