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In situ measurements of the tropospheric and tropopause and if possible lower stratospheric water vapour content will be carried out with different balloon sondes. Start of up to three balloons with Snow White Sensor-Package prepared by a team from the University of Nagoya and University of Kyoto. Possibly water vapour sondes from NOAA (S. Oltmans) will be started within the scope of an EU-project. This may happen earliest in autumn.