% gddelt
 GDFILE    Grid file                         barnes4.grd
 GDNUM     Grid numbers                      LIST
 Parameters requested: GDFILE,GDNUM.
 GEMPAK-GDDELT>gdfile = barnes1.grd
 GEMPAK-GDDELT>r
  NUM       TIME1              TIME2           LEVL1 LEVL2  VCORD PARM
    1     960227/1200                              0         NONE TMPF        
    2     960227/1200                              0         NONE DWPF        
    3     960227/1200                              0         NONE PMSL        
    4     960227/1200                              0         NONE SPED        
    5     960227/1200                              0         NONE DRCT        
 Enter grids to delete or type EXIT:1-5

      Deleting grid: 
    1     960227/1200                              0         NONE TMPF        
            to grid: 
    5     960227/1200                              0         NONE DRCT        
Enter  to delete grids or type EXIT:
 Parameters requested: GDFILE,GDNUM.
 GEMPAK-GDDELT>e

Now make 3 more copies of the file:

cp barnes1.grd barnes2.grd
cp barnes1.grd barnes3.grd
cp barnes1.grd barnes4.grd

Next, perform the Barnes Analyses

%oabsfc
 GEMPAK-OABSFC>l
 SFFILE   = metar
 GDFILE   = barnes1.grd
 SFPARM   = tmpf
 DATTIM   = /1200
 DTAAREA  = 
 GUESS    = 
 GAMMA    = .3
 SEARCH   = 5
 NPASS    = 2
 GEMPAK-OABSFC>r

 GEMPAK-OABSFC>gdfile = barnes2.grd
 GEMPAK-OABSFC>search = 10
 GEMPAK-OABSFC>r

 GEMPAK-OABSFC>gdfile = barnes3.grd
 GEMPAK-OABSFC>search = 20
 GEMPAK-OABSFC>r

 GEMPAK-OABSFC>gdfile = barnes4.grd
 GEMPAK-OABSFC>search = 50
 GEMPAK-OABSFC>r

 GEMPAK-OABSFC>e

Finally, lets plot it up: