SFMOD moves selected surface data from an input surface file to an output surface file. INPUT PARAMETERS SFFILE *Surface data file SFOUTF *Output surface file DATTIM *Date/time AREA *Data area PROGRAM DESCRIPTION SFMOD takes data from an existing GEMPAK surface file, SFFILE, and writes the data into another existing surface file, SFOUTF. This program can be used to subset the original dataset by time and/or stations. This program will not create a new surface file. The GEMPAK program, SFCFIL, can be used to create a surface file. If the parameters in the output file are not the same as the parameters in the input file, the required parameter conversions will be done. If a requested station or time is not in the output file, it will be added to the file if there is room. The number of times and stations that can be included in a file is specified by TIMSTN in SFCFIL. EXAMPLES 1. Put the data for all stations at the latest time in file TEST.SFC into a file called LAST.SFC. SFFILE = test.sfc SFOUTF = last.sfc DATTIM = last AREA = dset 2. Put the data for stations in Maryland and Virginia for all times into the output data set. SFFILE = test.sfc SFOUTF = last.sfc DATTIM = all AREA = @md/@va ERROR MESSAGES [SFMOD +3] Some stations were not added to file. [SFMOD +2] Character parameter cannot be used: ... [SFMOD +1] Parameter ... cannot be calculated. [SFMOD -1] Fatal error initializing TAE. [SFMOD -2] Fatal error reading TAE parameters. [SFMOD -3] There are no parameters to be computed. [SFMOD -4] Time ... cannot be added.