PRECIS output data appears in raw PP format in $ARCHIVEDIR/[runid]/[stash codes]/
You can view any PP files with xconv
xconv -i file.pp
For GrADs, I would do two things first
1) remove the outer 8 point rim
Code:
pprr -r 8 file.pp
That produces a file called file.rr8.pp
2) Regrid output from 1) to regular lat lon
Code:
ppregrid -d 0.22,0.22 file.rr8.pp
That will produce a file file.rr8.reg.pp
(If your RCM is using 50km resolution, use -d 0.44,0.44)
3) To convert to Grads-ready GRIB, use
Code:
pp2ctl file.rr8.reg.pp
that will produce a grib file *grb and a ctl file that GrADs needs
Thanks
David