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David, We decode the NLDN data from binary files into GEMPAK surface files and use SFMAP to plot the data, points, etc. Since your data is not of the same format as our IDD feed to use our dcnldn decoder, you can put your data into the ascii format used by SFLIST for importing into a GEMPAK surface file using SFEDIT as shown here: http://www.unidata.ucar.edu/cgi-bin/getfile?file=/content/support/help/MailArchives/gempak/msg04454.html Steve Chiswell Unidata User Support On Wed, 2006-03-22 at 13:58, David Novak wrote: > All - > > Is there a GEMPAK program to plot lightning data? It's not obvious to > me. I have text files with that contain > (1) date, (2) time, (3) latitude, (4) longitude, (5) peak current and > polarity, (6) chi square value > > Thanks! > Dave >