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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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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 > > _______________________________________________ > gembud mailing list > gembud@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > > > > _______________________________________________ > gembud mailing list > gembud@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ >
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