Isabella, try to rename your "template" file as follows: gpfs%y4%m2%d200cp_24h.grb your time step is day, so hour field shoul be fixed. hope this help, regards, oscar -------------- next part -------------- An HTML attachment was scrubbed... URL: http://gradsusr.org/pipermail/gradsusr/attachments/20090924/07ec5f36/attachment.html