WRF 2017 Major Release
WRF Release Information
The latest WRF release is Version 3.8.1 (August 2016), and details on it may be
The next major WRF release will be Version 3.9 and is targeted for
Spring 2017. Some of the potential features for the release are as follows,
but the ultimate inclusion of any candidate item is dependent on its timely preparation
and final acceptance. The timeline for the release is given further below.
- Dynamics: Hybrid vertical coordinate
- Software: PIO build, OpenMP updates
- Physics: P3 microphysics scheme, MSKF Cu scheme aerosol-cloud
interactions, Goddard radiation and microphysics updates, NSSL microphysics updates,
WENO advection mods, Noah-MP coupled with urban models, New LSM datasets (crop,
- WRFDA: 4D-EnVar capability, AMSR cloudy radiance obs, Null echo radar
assimilation, Large-scale analysis constraint
- WRF-Chem: New TUV photolysis scheme
- WRF-Hydro: Multiple time scale capability, New level pool scheme,
New bucket model, Netcdf output for baseflow bucket model
- HWRF: 2016 Operational changes, Idealized TC capability, G-F Cu scheme
Developers seeking to propose code for new or improved capabilities
for the WRF system must review
Prospective contributors may write to email@example.com for
information and for contacting
the Developers' Committee (which oversees WRF contributions
and manages the repository) or the Release Committee (which oversees
the major release process). Both the Developers' Committee and the Release Committee
are described in
Repository and Release Administration.
The consideration of any code for the WRF repository or a
release depends on the developer's following the physics review
procedures, meeting the testing and documentation
requirements, and meeting preparation requirements and the release schedule.
Developers should familiarize themselves with
for Code Contributors. Developers and contributors
may contact firstname.lastname@example.org for information on
how to prepare and provide their code.
Timeline— 2017 WRF Major Release
The timeline for the next major WRF release, scheduled for
Spring 2017, is as follows. "RC" refers to the Release Committee;
"DC" refers to the Developers' Committee.
Early September 2016
- RC begins meetings for major release cycle.
- Initial release picture compiled and schedule set.
Code accepted and admitted to the repository
is eligible (but not guaranteed) to be included in the release.
Code submissions must undergo all preliminary testing and acceptance
by the end of December in order to be considered for the release.
A release branch of the code will then be cut off and will be the
basis for the release code. While the WRF repository will remain open
to submissions after this time (as the repository is open throughout
the year), new additions will not be eligible for the release branch.
Release code testing and first friendly-use release
- Only bugfixes for preliminary release code permitted.
- WRF repository remains open for
code additions, which may be considered for releases after the 2017 major release.
- First friendly-user release— preliminary code made available for testing.
Late February 2017
- Second friendly-user release— revised preliminary
code made available for testing.
- Remaining bug fixes implemented.
- Full set of regression tests run on machines at NCAR.
- Final round of large testing. RC and DC meetings focus on
remaining code needs, testing, and final preparation.
- DC certifies code (final approval) for release. Code packaged and staged for release.
- Release and notification to WRF users.
The WRF Release Committee oversees the major releases of WRF. It
is described in the policies for NCAR's administration of the
WRF code in WRF Code Repository and Release Administration. The members are listed below.
Jordan Powers, NCAR/MMM— Chairman
Ravan Ahmadov, NOAA/ESRL
Michael Barlage, NCAR/RAL
Mrinal Biswas, DTC
Laurie Carson, DTC
Jimy Dudhia, NCAR/MMM
Dave Gill, NCAR/MMM
Michael Kavulich, NCAR/MMM
Steven Peckham, CRREL
Wei Wang, NCAR/MMM
Wei Yu, NCAR/RAL