Success! Thanks for your help. Justin Unidata Support wrote: Justin, Your nexrad.tbl listing below is incorrect. The nexrad.tbl file that should be used is a station location table ($GEMTBL/stns/nexrad.tbl). Make sure you don't have a nexrad.tbl file that is not a GEMPAK station table in your working directory. Your lines look like file template lines. The NEXRIII entry in $GEMTBL/config/datatype.tbl is the correct entry, and there should be only one NEXRIII template in that file: $RAD/NIDS/%SITE%/%PROD% %PROD%_YYYYMMDD_HHNN.....etc The likely problem you are having is the $GEMTBL/stns/nexrad.tbl file uses 3 letter station ID's which are used in the %SITE% template replacement. These match the PIL station IDs in the realtime NOAAPORT feed, eg: N0RILX, such that the supplied pqact pattern actions I provide name the files such as $RAD/NIDS/ILX/N0R. If you have used 4 letter station IDs in your file names, then you must either create a new station table that uses the 4 letter station IDs instead of the 3 letter IDs and use that in the STNFIL parameter, or rename your data directories using the 3 letter IDs. Steve Chiswell Unidata User SupportFrom: Justin Walters <address@hidden> Organization: UCAR/Unidata Keywords: 200509282303.j8SN3PG7028951This is a multi-part message in MIME format. --------------040209000605080403060800 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit OK. I'm making progress. gdinfo shows that there is a grid in the file, but gdplot2 doesn't show any data. I am using a nexrad.tbl file to point to my level III data: NEXRIII $RAD/NIDS/KILX/%PROD% %PROD%_YYYYMMDD_HHNN CAT_NIL SCAT_NIL 10 2880 -1 NEXRIII $RAD/NIDS/KDVN/%PROD% %PROD%_YYYYMMDD_HHNN CAT_NIL SCAT_NIL 10 2880 -1 NEXRIII $RAD/NIDS/KLSX/%PROD% %PROD%_YYYYMMDD_HHNN CAT_NIL SCAT_NIL 10 2880 -1 I have tried it with %SITE% in the path and also with only one site listed explicitly, both giving me no new result. Here's my gdradr input: GRDAREA Area covered by grid 38.8;-96.67;43.79;-87.01 PROJ Map projection/angles/margins|dr lcc/25;-103;60 KXKY Number of grid points in x;y 700;500 GDPFUN Scalar grid or vector grid funct n0r GDFILE Grid file 20030625_2232.gem RADTIM Radar composite current/dattim 030625/2232 RADDUR Radar time window (minutes prior 15 RADFRQ Update Frequency CPYFIL Grid file whose navigation is to STNFIL Station information file nexrad.tbl MAXGRD Maximum number of grids 1000 RADMODE Radar operational mode PC NDVAL Replacement value for "ND" (defa And here's my gdplot2 input: GDFILE Grid file 20030625_2232.gem GDATTIM Grid date/time 030625/2232 GLEVEL Grid level 0 GVCORD Grid vertical coordinate none PANEL Panel loc/color/dash/width/regn 0 SKIP Skip_cntr/skip_plt_x;skip_plt_y 0 SCALE Scalar scale / vector scale 0 GDPFUN Scalar grid or vector grid funct n0r TYPE GDPLOT2 function processing type z CONTUR Subbox/smooth 1 CINT Contour interval/min/max 1 LINE Color/type/width/label/smth/fltr 5/1/1/0 FINT Fill interval/min/max 5/5 FLINE Fill colors/fill types 0;26-24;21-23;20;18;17;15-7 HILO Color/symbol/rng/rad/cnt/intp HLSYM HILO txt size/posn/font/wdth/hw CLRBAR Color/ornt/anch/x;y/ln;wd/freq|t 1/V/CL/.975;.5/.5;.007 WIND Wind symbol/siz/wdth/typ/hdsz REFVEC Mag;x;y;txtsiz/font/wdth/HW;labl TITLE Title color/line/title 5/-1/~ Reflectivity TEXT Size/fnt/wdth/brdr/N-rot/just/hw 1/21//hw CLEAR Clear screen flag yes GAREA Graphics area 38.8;-96.67;43.79;-87.01 IJSKIP Iskp;Istrt;Istp/Jskp;Jstrt;Jstp PROJ Map projection/angles/margins|dr lcc/25;-103;60 MAP Map color/dash/width/filter flag 5/1/2 MSCALE fgc;bgc;mask/units/lat;hide/valu 0 LATLON Line color/dash/width/freq/inc/l DEVICE Device|name|x size;y size|color xw STNPLT Txtc/txt attr|marker attr|stnfil SATFIL Satellite image filename(s) RADFIL Radar image filename(s) IMCBAR Color/ornt/anch/x;y/ln;wd/freq LUTFIL Enhancement lookup table filenam none STREAM lines/arrows/stop/slow/scale POSN Position COLORS Color list 2 MARKER Marker color/type/size/width/hw GRDLBL Grid point label color 5 FILTER Filter data factor yes I'm almost there. I really appreciate the help. Justin ------------------------------------------------------------ Justin Walters University of Alabama in Huntsville 320 Sparkman Drive Huntsville, AL 35805 phone: (256) 961-7008 email: address@hidden fax: (256) 961-7755 ------------------------------------------------------------ Unidata Support wrote:Justin, The maximum grid size that can be computed in GDRADR is the value of GEMPAK's LLMXGD which is 400,000 points. Your grid is 480,000 points. Decrease your KXKY so that thr grid is =< 400000. Steve Chiswell Unidata User Support -- ****************************************************************************-- **************************************************************************** < Unidata User Support UCAR Unidata Program < (303)497-8643 P.O. 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