[Met_help] Problem with GRID-STAT

John Halley Gotway johnhg at rap.ucar.edu
Thu May 14 07:28:30 MDT 2009


That's an interesting question you raise.  I'm not sure if other users have run ECMWF data through MET.  In reading about ECMWF's use of GRIB, I'm guessing there may be issues with it.

But I'd like take a look at the data to see what the options are.  Would you mind sending me the two sample files you reference in your message, as well as the Grid-Stat configuration file you're using?

You can post this data to our anonymous ftp site:
ftp ftp.rap.ucar.edu
username = anonymous
password = "your email address"
cd incoming/irap/met_help/piani
put "your files"

Please let me know when you've posted the files, and I'll take a look.  Unfortunately, I don't know the answer to your question - whether there's an easy way of modifying which parameter table version
is used for a GRIB file.  I read through the information on copygb, and it doesn't look like it could do that.  I did look at ECMWF's webpage (http://www.ecmwf.int/products/data/software/) and some of
their software tools may be of use, but I'm really not sure.

John Halley Gotway
johnhg at ucar.edu

Francesco Piani wrote:
> Hi all.
> I would like to use MET, in particular GRID-STAT, to compare WRF_NMM at a resolution of 8km with the ECMWF 0.25° model. I use ggrid to extract the domain of interest (Italy) and copygb to regrid WRF_NMM fields over ECMWF grid.
> I noted that the two grib files use different parameter tables (in particular kpds5).
> 14596:100267650:d=07103112:T:kpds5=130:kpds6=100:kpds7=500:TR=1:P1=0:P2=0:TimeU=1:500 mb:anl:NAve=0
> 14597:100274520:d=07103112:Z:kpds5=129:kpds6=100:kpds7=500:TR=1:P1=0:P2=0:TimeU=1:500 mb:anl:NAve=0
> 14598:100281390:d=07103112:R:kpds5=157:kpds6=100:kpds7=500:TR=1:P1=0:P2=0:TimeU=1:500 mb:anl:NAve=0
> 14599:100288260:d=07103112:U:kpds5=131:kpds6=100:kpds7=500:TR=1:P1=0:P2=0:TimeU=1:500 mb:anl:NAve=0
> 14600:100295130:d=07103112:V:kpds5=132:kpds6=100:kpds7=500:TR=1:P1=0:P2=0:TimeU=1:500 mb:anl:NAve=0
> 7297:42763434:d=07123100:TMP:kpds5=11:kpds6=100:kpds7=500:TR=0:P1=12:P2=0:TimeU=1:500 mb:12hr fcst:NAve=0
> 7296:42756296:d=07123100:HGT:kpds5=7:kpds6=100:kpds7=500:TR=0:P1=12:P2=0:TimeU=1:500 mb:12hr fcst:NAve=0
> 7298:42768502:d=07123100:RH:kpds5=52:kpds6=100:kpds7=500:TR=0:P1=12:P2=0:TimeU=1:500 mb:12hr fcst:NAve=0
> 7299:42774812:d=07123100:UGRD:kpds5=33:kpds6=100:kpds7=500:TR=0:P1=12:P2=0:TimeU=1:500 mb:12hr fcst:NAve=0
> 7300:42780708:d=07123100:VGRD:kpds5=34:kpds6=100:kpds7=500:TR=0:P1=12:P2=0:TimeU=1:500 mb:12hr fcst:NAve=0
> Running GRID-STAT with a file CONFIG with this indication:
> fcst_field[] = [ "11/P850" ];
> obs_field[]  = [ "130/P850" ];
> I obtain an error like:
> ***WARNING***: process_scores() -> TMP/P850 not found in GRIB file: 2007_ecm_cut.grb.
> I imagine the problem was on the parameter table used by ECMWF. Is there a way to rewrite the GRIB file using the usual table (that defined by WMO)? I tried to use copygb with the option "-k" but with any results.
> Any suggestions?
> Francesco Piani
> Dott. Ing. Francesco Piani
> Weather Forecaster
> LaMMA Consortium - Hydrological Service Tuscany Region
> Via Madonna del Piano 10
> Sesto Fiorentino (FI)
> piani at lamma.rete.toscana.it
> francesco.piani at regione.toscana.it
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