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[Support #OQR-914852]: Processing NAM BUFR sounding files with NAMSND
- Subject: [Support #OQR-914852]: Processing NAM BUFR sounding files with NAMSND
- Date: Tue, 02 Jan 2007 10:48:53 -0700
Kevin,
I heard back from NCEP regarding these issues you raised.
- NCEP will add the snclass1.prm file change in their 10.2 release. I will
add it in to the 10.1 release I have from them already.
- The namsnd issue relates to the fact that the files being posted on the server
are using big endian blocking so the program runs on solaris, but you are
having failures with the little endian linux. I was pointed to a utility which
can
be used to unblock the data, and then reblock the data. The trick however is
that the
data must be unblocked on a big endian machine, and then reblocked on a little
endian machine.
This can be an immediate work around, but obviously an upgrade to the bufr
library is
needed.
I got the code last week in between blizzards here, but with the holidays and
closures, haven't
looked at building the utility yet. I'll add this utility to the 10.1 release
but can pass
on the tar file to you now if you want to look at it.
Thanks for providing the information regarding these problems!
Steve Chiswell
Unidata User Support
> I regularly process NAM soundings from the NCEP FTP server (path:
> pub/data/nccf/com/nam/prod/nam.YYYYMMDD/bufr.HHz) with NAMSND. I have
> found that in order to process them, $GEMTBL/pack/snclass1.prm needs to
> be modifed as follows:
> change the line
> TKEL 0. 40. .01
> to
> TKEL 0. 40. .01 1. IMXR
>
> As this modification needs to be done each time a new version of GEMPAK
> is enabled, can this change be added to future distributions?
>
> Also, while NAMSND works fine on Sun Solaris, it always aborts on Linux:
>
> SNBUFR BUFR model sounding file bufr.725180.2006120512
> SNOUTF Output sounding file 06120512_nam.snd
> SFOUTF Output surface file 06120512_nam.sfc+
> SNPRMF Sounding parameter packing file snclass1.prm
> SFPRMF Surface parameter packing file sfclass1.prm
> TIMSTN Times/additional stations 120/200
> Parameters requested: SNBUFR,SNOUTF,SFOUTF,SNPRMF,SFPRMF,TIMSTN.
> GEMPAK-NAMSND>r
>
> **************BUFR ARCHIVE LIBRARY ABORT*****************
> BUFRLIB: OPENBF - ERROR READING INPUT FILE CONNECTED TO UNIT 14 WHEN
> CHECKING FOR 'BUFR' IN FIRST 4 BYTES OF RECORD
> **************BUFR ARCHIVE LIBRARY ABORT*****************
>
> Finally, is there another model sounding/BUFR program that I should be
> using instead of NAMSND?
>
> Thanks!
>
> Kevin
>
> ______________________________________________________________________
> Kevin Tyle, Systems Administrator **********************
> Dept. of Earth & Atmospheric Sciences address@hidden
> University at Albany, ES-235 518-442-4578 (voice)
> 1400 Washington Avenue 518-442-5825 (fax)
> Albany, NY 12222 **********************
> ______________________________________________________________________
>
>
>
Ticket Details
===================
Ticket ID: OQR-914852
Department: Support GEMPAK
Priority: Critical
Status: Closed