The WRF model tar file has been updated to Version 3.1.1 on July 31, 2009. Most of the updates are bug fixes for the 3.1 release.

The WRF Pre-Processing System (WPS) has also been upgraded to Version 3.1.1.

WRF Version 3.1.1 new features, updates and bug fixes

WRF-NMM specific updates

• No WRF-NMM specific bug fixes included in this release.

General updates

Phyiscs:

• QNSESFC - remove print.
• BEP URBAN - allocate large arrays only if used (save space) - fix for nested runs.
• PX LSM - initialize surface snow when nudging not used, fix surface nudging interval to use sgfdda interval, restart problem.
• QNSE sfclay, QNSE PBL and Noah LSM
• QNSE sfclay, QNSE PBL and RUC LSM
• MM5 sfclay, YSU PBL and RUC LSM
• RUC LSM: use ACSNOM, and allow time-varying background albedo.
• Correct for a few typos in LANDUSE.TBL.
• Thompson and Thompson07 - allocate at run time (save space).
• LIN MP - fix units for WRF-Chem part. Minor change for rain evaporation calculation from Peter Blossey (UW).
• Surface_driver - fix for logicals set in OpenMP sections.
• CAM radiation - allocate local large arrays at run time (save space). Partially fixed OpenMP issue, but for global and adaptive time step cases, these are still not resolved.
• Physics_init- clean-up use of ONLY.
• If mp_zero option is activated, it extends to the boundary zone. It also modifies scalar and chem species.

Software:

• Memory requirement per processor reduced.
• Compilation using IBM xlf 12 compiler.
• Improved compile option for blue gene.
• Remove diagnostic prints from decomposition.