Version 3.9.0.1 of the WRF Pre-Processing System (WPS) was released on 13 July 2017.
The V3 WRF model is NOT backward compatible with old V2 input files. One must rerun WPS to generate data for real/wrf.
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Ungrib:
* Beginning 1200 UTC, July 19, NCEP upgraded GFS data, as well as several output datasets provided on its ftp site. The updates, which include adding missing values to land fields (such as soil temperature, moisture and snow etc.), and changing the landsea mask field, will break the WRF model if you are not using an updated version of WPS. It was necessary to update the ungrib program for compatibility with this new data. If it is preferred to use older versions of WPS, it is still necessary to use the ungrib.exe program, new Vtable.GFS, and METGRID.TBL.ARW from this tar file.
