[Met_help] MET/pcp_combine help

[John Halley Gotway]

Jeff,

Well I'd first check to see what's actually in that GRIB file using the
"wgrib" command.  For example, try this:
wgrib WRFPRS_d02.012_00 | grep APCP

That'll dump out the contents of that GRIB file, looking only for the APCP
records (accumulated precip).  Look to see if that file really does
contain a record for 0-12 hour accumulated precip.

If you have more questions about this, it'd probably be easier for you to
just send me some sample data to take a look at.  If you'd like to do
that, you could post it to our anonymous ftp site in the following way:

cd "the directory that contains the files you want to send"
ftp ftp.rap.ucar.edu
username = anonymous
password = "your email address"
cd incoming/irap/met_help
mkdir duda_data
cd duda_data
put WRFPRS_d02.012_00
put WRFPRS_d02.011_00
bye

Hope that helps.

John

> John,
> I am Bill Gallus' student and I am trying to use MODE to verify a WRF
> model
> run using accumulated precip.  To do this, I need to match Stage_IV data
> to
> my model grid.  To do that, though, I need to get a difference in precip
> file to compare with Stage_IV data (which has 1 hourly accumulated
> precip).
> My WRF files use run total accumulated precip.  I have run WPP on the
> NetCDF
> output of the WRF files and now am trying to use pcp_combine -subtract to
> basically subtract the total accumulated precip from one file from one an
> hour before it (my NetCDF output interval is 15 minutes).  When I tried to
> run pcp_combine, though, I got an error.  Can you help me with this,
> please?  Thank you.
>
>
> Here's a screen grab of the command and error:
>
> -bash-3.2$ /usr/local/METv2.0/bin/pcp_combine -subtract WRFPRS_d02.012_00
> 12
> WRFPRS_d02.011_00 11 20080719_18-17_precipdiff
> Reading input file: WRFPRS_d02.012_00
>
>
> ERROR: get_field() -> can't find grib code 61 with accumulation of 12
> hours
> in grib file: WRFPRS_d02.012_00
>
> Jeff Duda
> --
> Jeff Duda
> Iowa State University
> Meteorology Graduate Student
> 3134 Agronomy Hall
> www.meteor.iastate.edu/~jdduda
>