Grawmet is the meteorological software system for all GRAW groundstations based on Windows XP or Vista. The main functions of Grawmet are initialisation of the radiosonde for take-off and evaluation and display of radiosonde data during ascent. The system generates WMO and STANAG weather messages as well as various graphical and tabulated evaluations. The software uses the common windows style graphical user interface (GUI) making it easy to work with. The radiosondes data is received in the groundstation to be further processed by Grawmet.