although not needed for this tutorial, meteorological data files already formatted (ARL format) for use by HYSPLIT are available from several different FTP servers. These archives can be accessed directly using any FTP client or through the GUI from the Meteorology / ARL Data FTP tab. This menu provides access to Forecast data, a 24- or 48-h series of Appended forecasts (quasi-archive), an Archive of a variety of different regional and global data files, a special archive of the NCAR/NCEP global Reanalysis, and an option to set the server for the FTP connection.