Hurricane WRF Users Page

Release Notes

HWRF release notes

HWRF Version 3.9a

  • HWRF System Upgrades in v3.9a
      • Compatible with the 2017 operational HWRF.
      • WRF upgraded to v3.9.1 and GSI to v3.6.
      • D02 and D03 domain size decreased to ~ 24x24 degrees and ~ 7x7 degrees respectively.
      • Number of vertical levels increased to 75 with a model top of 10 hPa for the AL, EP, and CP basins and to 61 with a model top of 10 hPa for the WP basin and NIO.
      • Miscellaneous upgrades and bug fixes in various physical parameterizations.
        • Updated Scale Aware Simplified Arakawa Shubert scheme for cumulus parameterization.
        • Updated GFS Hybrid-Eddy Diffusivity Mass Flux PBL scheme.
        • Updated Ferrier-Aligo microphysics scheme.
        • Updated momentum and enthalpy exchange coefficients (Cd/Ch) in surface layer parameterization.
        • Updated partial cloudiness scheme for RRTMG.
      • Ocean upgrades
        • Reduced coupling time step from 9 min to 6 min for ocean coupling
        • Increased vortex tracking frequency.
        • Number of vertical levels in MPIPOM-TC increased from 24 to 41.
      • Initialization upgrades
        • Use of a new composite storm vortex for improved vortex initialization
        • Assimilating new data sets with GSI (hourly Atmospheric Motion Vectors /AMV/, clear-water-vapor AMV's)
      • New version of GFDL vortex tracker

    HWRF Version 3.8a

  • HWRF System Upgrades in v3.8a
      • Compatible with the 2016 operational HWRF.
      • WRF upgraded to v3.8, GSI to v3.5, and UPP to v3.1.
      • D02 and D03 domain size increased to 25x25 and 8.3x8.3 respectively.
      • Reduced time step from 38 4/7 s to 30 s.
      • Data Assimilation enabled by default for both Atlantic and Eastern North Pacific basins.
      • Initialization with RTOFS data in the Eastern North Pacific basin.
      • Atmosphere-ocean coupling enabled for all N. Hemispheric basins.
      • Miscellaneous upgrades and bug fixes in various physical parameterizations.
        • New Scale Aware Simplified Arakawa Shubert scheme for cumulus parameterization. Cumulus parameterization enabled by default for all 3 domains.
        • New GFS Hybrid-Eddy Diffusivity Mass Flux PBL scheme.
        • Updated momentum and enthalpy exchange coefficients (Cd/Ch).
        • Enhanced Idealized capability with landfall option (for GFDL slab scheme).
      • Enhanced products including simulated brightness temperatures for new satellite sensors in all basins

    HWRF Version 3.7a

  • HWRF System Upgrades in v3.7a
      • Compatible with the 2015 operational HWRF
      • WRF upgraded to v3.7, GSI to v3.4, and UPP to v3.0
      • Default horizontal resolution increased to 18/6/2 km (backward compatibility supported to run 27/9/3 km)
      • Vortex initialization algorithm improved to utilize the increased resolution of both GFS and HWRF
      • Coupled atmosphere-ocean and data assimilation supported for all ocean basins
      • Improved atmospheric physics for all scales
        • Replaced GFDL radiation parameterization with Rapid Radiative Transfer Model(RRTMG) and introduced sub-grid scale cloudiness parameterization
        • Modified specification of drag coefficient for momentum in the surface layer parameterization
        • Improved the GFS planetary boundary layer parameterization with specification of wind-speed dependent vertical mixing
        • Replaced GFDL slab model with the Noah Land Surface Model
      • Enhanced products including simulated brightness temperatures for new satellite sensors in all basins

    HWRF Version 3.6a

  • HWRF System
    • HWRF supported for all ocean basins, including Southern Hemisphere. Coupled forecast are supported only in AL and EP
    • Revised set of scripts in Python language
    • Bug fixes to address many of the Known Issues of v3.6b
    • Updated to support new capabilities described above
  • WRF model
    • Upgraded WRF to v3.6a
    • Revised nest tracking algorithm
  • Princeton Ocean Model for Tropical Cyclones
    • New MPIPOM-TC for running single transatlantic ocean domain and 3D coupling for Eastern North Pacific domain
    • Increased resolution (1/12deg) with MPIPOM-TC
  • Vertical levels and resolution
    • HWRF now has 61 levels with model top at 2 hPa
    • 3-km nest has expanded to 7.1x7.1 deg and 9km nest expanded to 12 x 12 deg
  • Data assimilation
    • GSI upgraded to version 3.3. Configuration changed to perform assimilation only on HWRF 9- and 3-km domains. Many datasets assimilated, including satellite radiances, GPS Radio Occultation, and aircraft tail Doppler radar winds.
  • Vortex Initialization
    • Revised Vortex Initialization and cycling of INVEST storms
  • Postprocessing
    • Advanced diagnostic products

    HWRF Version 3.5b

    • HWRF System
      • Only minor changes from v3.5a
      • Bug fixes to address many of the Known Issues of v3.5a
      • Added capability to support initializing from GFS GRIB files
    • WRF model
      • Bug fix for compiling on AIX with XLF.
    • Princeton Ocean Model for Tropical Cyclones
      • No change from v3.5a
    • Data preprocessing
      • HWRF can now be run from GFS GRIB files
    • Data assimilation
      • Bug fix applied for TDR assimilation quality control.
    • Vortex Initialization
      • No change from v3.5a
    • Postprocessing
      • No change from v3.5a
    • Scripts and wrappers
      • Bug fix applied for POM-TC initialization script
      • Update to support new capabilities described above

    HWRF Version 3.5a

    • HWRF System
      • Upgrade to contain 2013 HWRF operational capability
      • Support for NetCDF and binary I/O format
    • WRF model
      • Upgraded to WRF v3.5a, the HWRF 2013 operational capability added to WRF v3.5
      • GFS planetary boundary layer (PBL) parameterization (bl_pbl_physics=3) updated to use a variable critical Richardson number
      • Revised algorithm for internal vortex tracking
      • Nest-parent interpolation routines rewritten for faster computation
      • Supported use in all Northern Hemisphere basins
      • Tropical Cyclone idealized capability
      • Ability to run with alternate microphysics schemes
      • Configuration revised to use larger inner nest and shorter physics timesteps
    • Princeton Ocean Model for Tropical Cyclones
      • Upgrades on atmosphere-ocean fluxes to better represent storm intensity
    • Data preprocessing
      • New community supported tool, prep_hybrid, allows ingestion of spectral global model data in its native sigma vertical levels, in binary format
    • Data assimilation
      • Upgrade to Gridpoint Statistical Interpolation (GSI) v3.2
      • Ability to use ensemble-variational hybrid data assimilation
      • Ability to ingest Tail Doppler Radar from aircraft reconnaissance
      • Support for First Guess at Appropriate Time (FGAT), a capability to assimilate observations over a time window using a time sequence of first guess backgrounds
    • Vortex Initialization
      • Upgrades for better representation of weaker storms
    • Postprocessing
      • Extended support for simulated synthetic satellite imagery
    • Scripts and wrappers
      • Update to support new capabilities described above

    HWRF Version 3.4a

    • WRF model component upgraded to WRF v3.4a, the HWRF 2012 Operational Capability added to WRF v3.4
      • Three domains, parent and two telescoping storm-following moving nests with 27-, 9- and 3-km horizontal grid spacing.
      • Upgraded SAS cumulus scheme now with both deep and shallow convection.
      • New internal vortex tracking algorithm designedfor high resolution.
      • Improved physics interoperability, with additional physics schemes now working with the HWRF configuration.
      • Updates to the PBL and microphysics schemes for improved forecasts.
      • Optional high frequency (each time step) ascii output of storm location, maximum surface winds, and radius of maximum winds.
    • Vortex initialization algorithm revised for the new high-resolution 3rd moving nest.
    • East Pacific domain for the ocean component Princeton Ocean Model (POM) added.
    • GSI upgraded to v3.1, with additional HWRF specific modifications.
    • Postprocessing UPP upgraded to create satellite images.
    • GFDL vortex tracker upgraded to include cyclogenesis tracking and hurricane diagnostics of thermodynamic phase.
    • Revised HWRF system run scripts.
    • Miscellanous bug fixes.

    HWRF Version 3.3a

    • WRF model upgraded to WRF v3.3a, the HWRF 2011 Operational Capability added to WRF v3.3
      • Simplified Arakawa Schubert (SAS) cumulus parameterization scheme upgraded to the scheme used in the GFS model
      • Surface momentum and enthalpy flux calculation modified to better match observations
      • CO2 transmission coefficient now calculated at run time
      • Preliminary development towards optional third moving nest domain capability added
      • Preliminary development towards alternate vortex following algorithm added
      • Recent bug fixes made to SAS, microphysics, and radiation will make the answer of the community HWRF code differ from the code implemented for 2011 operations at NCEP.
    • Vortex initialization algorithm revised with improved storm size correction and improved initial mass-wind balance
    • Grid-Point Statistical Interpolation (GSI v2.5) data assimilation capability added
    • East Atlantic domain for the ocean component Princeton Ocean Model (POM) added
    • Postprocessing upgraded from WPP to Unified Post Processor (UPP)
    • Other bug fixes

    HWRF Version 0.9 beta

    • The beta release consists of customized versions of the components, HWRF utilities, POM-TC, NCEP Coupler, GFDL Vortex Tracker, WRF, and WPP.
    • The beta release uses the public release version of WPS.

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