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Hi Chiswell, Ok. Now I am inserting the data as SKNT. This works. :-) Now I have the instructions to - request the data of PCD/INPE by ldm. - insert them on GEMPAK using a perl script. - modify the GEMPAK GUI to plot these data. About the Brazil's political map and cities, what files I need to change ? Many Thanks, Waldenio. Unidata Support wrote: > > Waldenio, > > Store the data as SPED (units are m/s) or SKNT (units are knts) > and DRCT, and GEMPAK will be able to plot the wind barbs by > composing the vector BRBM in m/s, or BRBK in knts). > > Steve Chiswell > Unidata User Support