Problem reading NCEP RTMA grib2 files

Hi All,

     I try to plot NCEP Real-Time Mesoscale Analysis (RTMA) hourly
2-m temperature field using ncl, but I could not read those grib2 files
properly. I have uploaded an example file called LTIA98_KWBR_201107010000
to ftp.cgd.ucar.edu:/incoming The same file can be downloaded directly
from NCDC RTMA archive via wget. The link is
http://nomads.ncdc.noaa.gov/data/ndgd/201107/20110701/LTIA98_KWBR_201107010000
The file size is about 8 megabytes.

     The file should have two records, one for the temperature analysis and the
other for the analysis uncertainty. Wgrib2 utility confirms that:

1:0:d=2011070100:TMP:2 m above ground:anl:
2:4799894:d=2011070100:TMP:2 m above ground:anl:analysis/forecast error

     However, in my ncl script, or from ncl_filedump, or from ncl_convert2nc,
I can only see one record, the 2nd record. My work-around is to use wgrib2
to extract the record I want and then use ncl to process it.

     I am wondering if there are ways to access the 1st record in ncl.

     I am using ncl 6.1.2 (not OPeNDAP-enabled pre-compiled binary)

     Thanks.

           Winston

Winston Hao
New York State Dept of Environmental Conservation
625 Broadway, 9th Floor, Albany, NY 12233-3259
whao@dec.state.ny.us (518)402-8384 (Work) (518)402-9035 (Fax)

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Received on Wed Mar 6 11:07:23 2013