A method for creating a fort.22 input file is provided that comprises the steps of receiving a plurality of user parameters, the plurality of user parameters comprising one or more meteorological data sources, a defined date range, and a data processing request. Then, the one or more meteorological data sources are read for the defined date range. A properly formatted fort.22 file is prepared based on the reader data. Next, it is determined whether a data processing request is present, and if a data processing request is present, an extension/ramping processing program is performed. Finally, the fort.22 file is outputted to a user.