[Met_help] pcp_combine

John Halley Gotway johnhg at ucar.edu
Fri Apr 9 10:24:17 MDT 2010


Thanks for sending the sample data.  I retrieved it from the FTP site and ran it through pcp_combine here.  I ran it through pcp_combine in two ways: once using the pcp_combine code as originally
released, and once using the pcp_combine code after applying all the latest patches posted on the MET website (http://www.dtcenter.org/met/users/support/known_issues/METv2.0/index.php).

In both cases, pcp_combine ran fine and created an output file - no NetCDF errors.  I've attached the resulting NetCDF file.  However, I would like to point out that you really don't need to run
pcp_combine to subract 24-hour accumulation minus 0-hour accumulation.  The 0-hour accumulation should contain zero precip values anyway.  So you could just use the 0-24 hour GRIB file in the other
MET tools directly.

Since you're seeing this NetCDF problem when you run PCP-Combine, I'm wondering if you could take a step back and try running the test script:
  cd METv2.0/scripts
  ./test_pcp_combine.sh >& test_pcp_combine.log

That'll run the PCP-Combine test script and dump its output to a log file.  I'm wondering if you'll see NetCDF errors there as well.


Jianting Chu wrote:
> Dear Sir,
>     I encountered a trouble with pcp_combine.
>     With the wrfout files, the precpitation is accumulated every hour 
> (history_interval=60), so I wanna use pcp_combine to get daily 
> precipitation.
>     If I use the command:
>             > ./pcp_combine -subtract test_WRFPRS_d01_19890102.000 24 
> test_WRFPRS_d01_19890101.000 0 test_19890101.nc -v 1000
>     it will say:
>             NetCDF: Numeric conversion not representable
>       So, it seems that the problem is caused by NetCDF, but I am not sure.
>     I have uploaded test_WRFPRS_d01_19890101.000.gz, 
> test_WRFPRS_d01_19890102.000.gz and pcp_combine to your ftp: 
> /incoming/irap/wrfhelp. Would you please checking it?
>     I need to explain something before:
>         1) we use rotated lat-lon projection for our WRFv3.1, and use 
> the lasted WPP to transform its format to GRIB;
>         2) Because MET does not recognize the rotated data, we use CDO 
> to do the de-rotation (copygb is not possible for linux currently). I 
> have used Xconv and wgrib to check the de-rotated results, it seems 
> reasonable;
>         3) pcp_combine is produced by gfortran compiler.
>     What is the problem?
> Best wishes,
> Jianting
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