[gradsusr] GFS grb2 to grb1 conversion issue

[Wesley Ebisuzaki - NOAA Federal]

Sam,

   I was able to reproduce your problem using the operational
cnvgrib utility at NCEP.  The problem seems fixable but
get expert advice.

From:http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2/

  "For questions related to the cnvgrib software, send mail to
NCEP.NCO.GRIB at noaa.gov."

Wesley





On Thu, Nov 19, 2015 at 5:37 PM, Sam Wilson <sam at surfline.com> wrote:

> Hi,
>
> I’m running into an issue with the resulting grib1 file produced from
> converting a long range (>=264 hr forecast) GFS grib2 file with the cnvgrib
> utility.
>
> I’ve attached the initial grib2 file I’m working with as an example - this
> file contains only my variables of interest.
>
> I want to convert this file to grib1, which I do using the following:
>
> 1.) wgrib2 gfslr2015111912hr384.grb2 -grib temp.grb2
>
> 2.) cnvgrib -g21 temp.grb2 gfslr2015111912hr384.grb
>
> When I run wgrib on the file grib1 file, it gives the following output:
>
> 1:0:d=15111912:TMP:kpds5=11:kpds6=105:kpds7=2:TR=10:P1=1:P2=128:TimeU=1:2
> m above gnd:384hr fcst:NAve=0
> 2:114114:d=15111912:RH:kpds5=52:kpds6=105:kpds7=2:TR=10:P1=1:P2=128:TimeU=1:2
> m above gnd:384hr fcst:NAve=0
> 3:195648:d=15111912:UGRD:kpds5=33:kpds6=105:kpds7=10:TR=10:P1=1:P2=128:TimeU=1:10
> m above gnd:384hr fcst:NAve=0
> 4:301616:d=15111912:VGRD:kpds5=34:kpds6=105:kpds7=10:TR=10:P1=1:P2=128:TimeU=1:10
> m above gnd:384hr fcst:NAve=0
>
> 5:407584:d=15111912:APCP:kpds5=61:kpds6=1:kpds7=0:TR=4:P1=116:P2=128:TimeU=1:sfc:*116-128hr
> *acc:NAve=0
>
> 6:513552:d=15111912:CSNOW:kpds5=143:kpds6=1:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:sfc:
> *116-128hr* ave:NAve=0
>
> 7:521780:d=15111912:CICEP:kpds5=142:kpds6=1:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:sfc:
> *116-128hr* ave:NAve=0
>
> 8:530008:d=15111912:CFRZR:kpds5=141:kpds6=1:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:sfc:
> *116-128hr* ave:NAve=0
> 9:538236:d=15111912:LFTX:kpds5=131:kpds6=1:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:sfc:384hr
> fcst:NAve=0
> 10:611624:d=15111912:CAPE:kpds5=157:kpds6=1:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:sfc:384hr
> fcst:NAve=0
> 11:717592:d=15111912:PWAT:kpds5=54:kpds6=200:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:atmos
> col:384hr fcst:NAve=0
> 12:799126:d=15111912:TCDC:kpds5=71:kpds6=10:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:atmos
> col:*116-128hr* ave:NAve=0
> 13:856224:d=15111912:PRMSL:kpds5=2:kpds6=102:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:MSL:384hr
> fcst:NAve=0
>
> I’ve put in bold the the issues I’m seeing - those variables are giving me
> undefined values when I try to plot them, which I assume is due to the
> above issue.
>
> I think #43 at the following link describes this problem, so it seems to
> be a known issue:
>
> http://ftp.cpc.ncep.noaa.gov/wd51we/wgrib2/tricks.wgrib2
>
> I tried running the suggestion in #43 on my initial grib2 file, then ran
> cnvgrib but I get the same bad results with the grib1 file.
>
> Is their another workaround to this problem I could try?
>
> The versions of the utilities I’m running are below:
>
> wgrib2 v0.1.9.4
> wgrib v1.8.0.13f
> cnvgrib-1.1.4
>
> Thanks for any help you can provide.
>
> Cheers,
> Sam
>
>
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