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There are five options under the Forecast Data FTP menu tab for retreiving forecast meteorological data. The ARL options access the Air Resources Laboratory's FTP server and the NCEP options access the National Center’s for Environmental Prediction’s FTP server. All data available from the ARL server have already been converted to a HYSPLIT compatible format. The NCEP menu’s access GRIB data and these data are converted during the download process. Note that ARL forecast data consist of one file – the most recent forecast available, while the NCEP data consist of one GRIB file per forecast time. Each one is processed in sequence. The last several forecast cycles from the NCEP server are available for download. The option to "Set Server" allows the user to modify the location of the ftp servers used by the HYSPLIT GUI. FTP Processed Data from ARLThe forecast data on the ARL server covers 3 geographic domains. North America
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