Unidata GEMPAK 7.3.1

GEMPAK 7.3.1 is available as source code, 64-bit Linux binaries, and an OS X binary tarball. The most significant updates in this release are to GEMPAK's Python scripts which retrieve data from an AWIPS EDEX server.

7.3.1 binary and source code releases are available at

Both a standard binary and a version built against Python 2.7 for use with the python-awips package (see: http://python-awips.readthedocs.io) are available. Please consult the updated install instructions at http://www.unidata.ucar.edu/software/gempak/doc/install.html for more information.

How to retrieve AWIPS data with GEMPAK?

If you have installed gempak-python and python-awips, or built GEMPAK from source against python 2.7:

  • Set/change the EDEX server defined in Gemenviron.profile or Gemenviron (default is edex-cloud.unidata.ucar.edu)
  • Ensure that libpython2.7.so* is found (e.g. ldd $OS_BIN/gdinfo)
  • Entries in datatype.tbl are used to define AWIPS grid names
    grep ^A2 $GEMTBL/config/datatype.tbl
    A2METAR      AWIPSDB                   metar.xml  
    A2SYNOP      AWIPSDB                   synop.xml  
    A2UAIR       AWIPSDB                   uair.xml   
    A2GFS        AWIPSDB                   gfs.xml    
    A2GFS20      AWIPSDB                   gfs20.xml  
    A2GFS80      AWIPSDB                   gfs80.xml  
    A2RAP        AWIPSDB                   rap.xml    
    A2NAM        AWIPSDB                   nam.xml    
    A2NamDNG     AWIPSDB                   namdng.xml 
    A2NAVGEM     AWIPSDB                   navgem.xml 
    A2DGEX       AWIPSDB                   dgex.xml   
    A2HRRR       AWIPSDB                   hrrr.xml   
    A2CMC        AWIPSDB                   cmc.xml    
    A2ECMWF      AWIPSDB                   ecmwf.xml  
    A2MRMS       AWIPSDB                   mrms.xml   
    A2RTMA       AWIPSDB                   rtma.xml   
    A2URMA       AWIPSDB                   urma.xml

These xml files are found in $GEMTBL/data-access/, and each defines the AWIPS/EDEX grid name used (e.g. dbkey="GFS20" for gfs20.xml)

An example in GDINFO:

    GDFILE   = A2GFS20
    LSTALL   = YES
    OUTPUT   = t
    GDATTIM  = last
    GLEVEL   = 500
    GVCORD   = pres
    GFUNC    = all

GRID FILE: AWIPSDB/gfs20.xml/161129/1200F240                                                                   

 GRID NAVIGATION: 
     PROJECTION:          LCC                 
     ANGLES:                25.0   -95.0    25.0
     GRID SIZE:              369     257
     LL CORNER:            12.1900 -133.4590
     UR CORNER:            57.2894  -49.3853

 GRID ANALYSIS BLOCK: 
     ANALYSIS TYPE:        BARNES
     DELTAN:               1.000
     DELTAX:           -9999.000
     DELTAY:           -9999.000
     GRID AREA:           -90.00 -180.00   90.00  180.00
     EXTEND AREA:         -90.00 -180.00   90.00  180.00
     DATA AREA:             0.00    0.00    0.00    0.00

 Number of grids in file:   258

 Maximum number of grids in file:    258

  NUM       TIME1              TIME2           LEVL1 LEVL2  VCORD PARM
  138     161129/1200F240                        500         PRES TMPK        
  139     161129/1200F240                        500         PRES UREL        
  140     161129/1200F240                        500         PRES RELH        
  141     161129/1200F240                        500         PRES HGHT        
  142     161129/1200F240                        500         PRES OMEG        
  143     161129/1200F240                        500         PRES VREL        
  144     161129/1200F240                        500         PRES HGHT5       
  145     161129/1200F240                        500         PRES AVOR    
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