This menu item is intended to convert existing NDAS GRIB files to the ARL packed format. The same program is used to convert NAM forecast data as NDAS archive data. NDAS GRIB files must be on AWIPS 212 grid. The data files to process are determined by selecting any file in the GRIB directory. Subsequent file names will be constructed automatically between the starting and ending day at the hour interval set by the radio-button. Day and hour are assumed to be the last four digits of the file name: {base}{DD}{HH}. Time intervals of 12 hours or more should be avoided in transport and dispersion calculations. Only one month of data or less should be processed into one output file. HYSPLIT cannot properly position to the correct starting data record if there is a month transition included within a data file.