WRF-NMM Users Page

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WRF Modeling System Updates

Funding to maintain WRF-NMM at the DTC has ended and support will no longer be provided. To download HWRF, please see: www.dtcenter.org/HurrWRF/users. To download WRF-ARW, please see: www2.mmm.ucar.edu/wrf/users . To download NEMS-NMMB, please see: www.dtcenter.org/nems_nmmb/users.To download UPP, please see: www.dtcenter.org/upp/users.

The WRF model tar file has been updated to Version 3.6.1 on August 14, 2014. In order to upgrade to version 3.6.1, users can obtain a new copy of the code from the download page.

The WRF Pre-Processing System (WPS) has also been upgraded to Version 3.6.1.

Also see 'Known Problems' in this release. If you are interested in seeing how V3 has been tested, click here.

WRF Version 3.6.1 new features, improvements and bug fixes

WRF-NMM and HWRF specific updates

All capabilities used in the 2014 operational HWRF model, including:

New vortex tracking algorithm for nest movement
Updates on parent-nest feedback routines
New tornado genesis diagnostic products
Additional diagnostics/output
Miscellaneous improvements and bug fixes

For additional details, click here

General Updates

Improvements and bug fixes to physics options
Atmospheric Radiation:

Use equation of time for old Goddard shortwave - also corrects diffuse/direct diagnostics
Bug fix in FLG scheme
Bug fix for interpolating shortwave radiation at non-radiation steps: GSW (posted)
RRTMG shortwave radiation: extinction coefficient updated from RRTM group
Fix for cu_rad_feedback option (posted 5/7/14) and use of restart with this option

Microphysics:

Bug fix for Milbrandt scheme (no surface rain output in v3.6)
Bug fix for SBM (posted 5/7/2014) and minor update for fast SBM scheme
Hail control for Morrison scheme is namelist controlled: hail_opt
Constant n_ccn0 is now an namelist variable: ccn_conc (used in WDM5 and WDM6)
New lightning scheme (lightning_option = 3) (Thanks to B. Lynn)

Cumulus:

NSAS deep: the default value for the v3.6-introduced option nsas_dx_factor is set to 0 (off) in Registry.EM_COMMON

Surface and surface layer physics:

Bug fix in lake physics for nesting
Bug fix for fractional seaice for surface layer option 1: old surface layer code was used in v3.6
Bug fix in simple ocean mixed layer scheme
PX LSM should be able to use MODIS+Lake data
Dissipative heating is removed with ISFTCFLX

Others:

Bug fix for SKEBS

Initialization/IO:

Option to use GFS tropopause and max wind level data
Option to define stratospheric base state (namelists base_pres_strat, base_lapse_strat)
Bug fix for climate extreme statistics for nested run
Better error message for ndown
Option to write out output-ready flag (wrfoutReady_d_) activated by namelist option output_ready_flag in &time_control)
Microphysics-dependent reflectivity computation is only output if do_radar_ref is set to 1 (for those schemes that makes use this option)
Bug fix for a potential overflow problem for vegfra, shdmax, shdmin for program real
Improved wrfbdy read speed at restart
Bug fix for periodic boundary condition in Y for geopotential

Dynamics:

Improved diffusion with diff_opt = 4 and km_opt = 2
Fix tke_km routine computation of N stability parameter for km_opt=2

Software:

Fix for using netCDF4 on NCAR's yellowstone system (configure.nc4 removed)
Fixes for adapting to new CPP
Remove few more use of flush
#ifdef WRF_CHEM changed to #if ( WRF_CHEM == 1 ) to avoid confusion with environment setting of WRF_CHEM = 0