dcgrib2 fails on RAP wrfprs grib2 files with errors

[mzuranski]

• the version of the software with which you are encountering an issue
  7.14.0.1 and 7.15.2
• environmental information (i.e. Operating System, compiler info, java version, python version, etc.)
  Ubuntu 20.04 and CentOS 7
• a description of the issue with the steps needed to reproduce it
  dcgrib2 test.gem < rap.t02z.wrfprsf01.grib2

Initially reported by @vgensini, dcgrib2 errors out when trying to decode a RAP wrfprs grib2 file (7.14.0.1). I was able to reproduce this on my end as well (specifically with this data file) (7.14.0.1 and 7.15.2).

Output from @vgensini:

dcgrib2 test.gem < rap.t02z.wrfprsf01.grib2
 Opening WMO Originating Center Table wmocenter.tbl...
 Opening WMO GRIB2 Parameter Table g2varswmo2.tbl...
 Opening WMO GRIB2 Vertical Coordinate Table g2vcrdwmo2.tbl...
 WARNING : Grid Definition Template 3.32769 not supported.

My output:

dcgrib2 test.gem < rap.t02z.wrfprsf01.grib2
 Opening WMO Originating Center Table wmocenter.tbl...
 Opening WMO GRIB2 Parameter Table g2varswmo2.tbl...
 Opening WMO GRIB2 Vertical Coordinate Table g2vcrdwmo2.tbl...
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 Opening Local GRIB2 Parameter Table g2varsncep1.tbl...
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
 Opening Local GRIB2 Vertical Coordinate Table g2vcrdncep1.tbl...
 WARNING : Grid Definition Template 3.32769 not supported.
 WARNING : Grid Definition Template 3.32769 not supported.
...it keeps going on like this a while...

This table seems relevant. But that table is also over a decade old, and searching the codebase I see references to it in various places. While this feels like a table issue of some kind it's unclear to me right now what's going on.

[wblumberg]

I believe this issue may be due to the way that the grids are stored in the *wrfprs.grib2 file. They are on an Arakawa semi-staggeblack A-grid on a rotated Latitude/Longitude grid.

https://www.ssec.wisc.edu/realearth/solved-north-american-domain-rap-13-5km-rotated-pole-grib2-for-gis/