WRF-Hydro® v5.4.0

Version 5.4.0 of the Community WRF-Hydro® Modeling System source code is consistent with the NOAA National Water Model (NWM) v3.1 code in operations and includes the following changes, additions, and fixes:

---

WRF-Hydro® v5.4.0 Release Notes

Please note that starting with WRF-Hydro v5.4, CMake is the preferred build system. The legacy configure/compile scripts are still present, but should be considered deprecated and will not be supported in future releases.

WRF-Hydro model documentation has been migrated from individual Word and PDF files to an online documentation system that will be hosted alongside the model code in the GitHub repository. Please see the docs/ directory for more details and view the documentation on the web at:

https://wrf-hydro.readthedocs.io/en/latest

For specific updates, reference the PRs listed in the following sections:

Model Improvements

• PR#756: Add initial support for gage-assisted diversions in channel
  routing, which requires a new optional Diversion netCDF parameter file.
  This also adds a C compiler dependency
• PR#725: lake_option added to &hydro_namelist to override lake physics
  options (or turn off lakes completely). Reservoir options have been moved
  to a new, separate &reservoir_nlist namelist
• PR#743: liquid water fraction (or snow) added as optional forcing input variables
  Forcing variables names can now be supplied as namelist inputs
• PR#782: documentation converted to readthedocs, also PR#786, PR#785,
  PR#774, PR#789, PR#795, PR#796, PR#792, PR#799, PR#798, PR#791, PR#799,
  PR#798, PR#797, PR#805, PR#804, PR#809, PR#810

Bugfixes:

• PR#803, PR#808: lake_option bugfixes
• PR#813: Finding NetCDF fix for new Derecho environment
• PR#811: Adding routing diversion Makefiles
• PR#785: Support Fedora MPI environmental variables for NetCDF
• PR#752: LSM accumulations not reset if RSTRT_SWC equals no reset
• PR#729: Crocus glacier arrays changed to optional from allocatable
• Bugfixes: CMake nudging parallel build

General cleanup and misc.

• PR#802: increment version numbers
• PR#794: input namelists and parametere tables
• PR#790: PR template updates
• PR#764: adding deprecation warning to configure build, CMake preferred
• PR#739: general CMake improvements, tabs to spaces
• PR#720: header info from files removed
• PR#724: redundant return statements removed
• PR#723: MPI case style fixed
• PR#733: .F -> .F90 file renaming
• PR#717: Added citation file

2025.10.23 Updates

The file croton_NY_training_example_v5.4.tar.gz was re-uploaded after missing files were added. Missing files included ones in the long range domain directories and the following files in NWM/DOMAIN/

• LAKE_TYPES.nc
• nudgingParams.nc
• params.txt