Re: [gembud] NARR conversion to height coordinates?

Peter, Josh,

Gave this a shot as well but the date/time difference is a problem.  a
decoded AWIP32-fixed.grb file has GDATTIM = 791108/0000F000 which will not
be read when doing a GDVINT pres/zagl conversion on f00.

However, I was able to convert first from pres-to-hght and then
hght-to-zagl, without the AWIP32-fixed grids, but I'm not confident the
final grid file is correct.

-Michael



On Fri, Oct 5, 2012 at 10:49 AM, Joshua Boustead <josh.boustead@xxxxxxxx>wrote:

> Hi Peter,
>
> To covert the pressure to AGL using GDVINT I think you need to add the
> surface file to the NARR first. You can download the surface file from the
> NOMADS site (http://nomads.ncdc.noaa.gov/data/narr). It is called
> AWIPS32-fixed.grb. Convert that to GEMPAK and then add it to the NARR
> GEMPAK file and then try to convert it. I'm not 100 percent that will work,
> but it worked for me when I got that same error.
>
> Josh
>
> On Oct 4, 2012, at 9:38 AM, Peter Banacos <Peter.Banacos@xxxxxxxx> wrote:
>
> All:
>
> I'm trying to convert NARR gem files from pressure to height (agl)
> coordinates using GDVINT. I've tried various combinations for VCOORD
> but I always receive the same error about "required surface elevation is
> absent". When I downloaded the grib files, I selected all variables.
> Here is some sample output:
>
>  GEMPAK-GDVINT>display
>  GDFILE    Grid file                         20100128_1800.gem
>  GDOUTF    Output grid file                  20100128_1800z.gem
>  GDATTIM   Grid date/time                    f00
>  GVCORD    Grid vertical coordinate          pres/zagl
>  GLEVEL    Grid level                        500-10000-500
>  MAXGRD    Maximum number of grids           999
>  GAREA     Graphics area                     grid
>  VCOORD    Vertical coordinate type          pres;none
>  GEMPAK-GDVINT>r
>  PRES         found.
>  TMPK         found.
>  HGHT         found.
>  SPFH         found.
>  OMEG         found.
>  UWND         found.
>  VWND         found.
>  TKE          found.
>  CLWMR        found.
>  ICMR         found.
>  MCONV        found.
>  LFTX         found.
> * [GDVINT 4]  Warning--no surface elevation grid exists.
>  [GDVINT -7]  Required surface elevation is absent.
> * Parameters requested: GDFILE,GDOUTF,GDATTIM,GVCORD,GLEVEL,MAXGRD,GAREA,
>  VCOORD.
> Does anyone have any experience converting NARR to height AGL coordinates?
> Thanks in advance.
>
> --
> Peter C. Banacos, Lead Forecaster
> NOAA/National Weather Service
> WFO Burlington, VT
> weather.gov/btv
> E-mail: peter.banacos@xxxxxxxx
> Phone: (802) 862-2475
>
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