Re: Problem reading NCEP RTMA grib2 files

Hi Winston,

I will look into this. Thanks for the report.
 -dave

On Mar 6, 2013, at 11:07 AM, Winston Hao wrote:

> 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 12:09:02 2013