Software Release: HWRFv4.0a Release

The DTC Hurricane team is pleased to announce the release of version 4.0a of the community HWRF modeling system. The release includes all components of the system: scripts, data preprocessing, vortex initialization, data assimilation, atmospheric and ocean models, coupler, postprocessor, and vortex tracker. Both the Scientific Documentation and the Users Guide have been updated.

Users may go to to download codes, acquire datasets, and get information and documentation about HWRF.

The upgrades in version 4.0a are listed below:

  • Compatible with the 2018 operational HWRF.
  • WRF upgraded to v4.0, updated GSI
  • Horizontal resolution increased from 18/6/2 km to 13.5/4.5/1.5 km
  • D02 and D03 domain size decreased to ~ 17.8 x 17.8 degrees and ~ 5.9 x 5.9 degrees, respectively.
  • Number of vertical levels increased to 75 with a model top of 10 hPa for all ocean basins.
  • Miscellaneous upgrades and bug fixes in various physical parameterizations.
    • New cloud overlap method in RRTMG radiation parameterization.
    • Updated horizontal diffusion and convergence damping coefficients.
  • Ocean upgrades
    • New POM domain for the north Central Pacific basin
  • Initialization upgrades
    • Dropsonde drifting is considered when assimilation is done
    • Assimilating new data sets with GSI (GOES-16 AMV, NOAA-20, SFMR, TDR from G-IV)
  • Addition of precipitation rate (PRATE) variable in GRIB2 files

For questions and inquires, contact

The DTC would like to encourage prospective contributors to apply to the DTC visitor program for transitioning research to the operational HWRF system. Proposals are accepted year-around. Please check the visitor program webpage ( for the latest announcement of opportunity and application procedure.