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John, At this point, gdtraj always gets the list of forecast hours in the file and uses the earliest found. I will investigate what needs to be done to allow the user to specify what range of forecast hours to use. Steve Chiswell Unidata User Support >From: address@hidden >Organization: UCAR/Unidata >Keywords: 200105101601.f4AG1Pp02857 >Hi-- > >I tried using the new gptraj and found it a helpful program for a >project. However, I can't seem to make it start at an arbitrary time. > It always starts at the grid initialization time, f000. I have entered >other times, eg. f024, in GDATTIM and get the same results. > >Is there a way to have the program start the trajectory at another >forecast hour? > >Thanks in advance, > >John M. Hobbie >National Scientific Balloon Facility >address@hidden >