To obtain the meteorological parameter temperature, humidity, air pressure and wind not only at the ground but also above little instruments - called radiosondes - monted on weather balloons get started. During flight all parameters get broadcasted every 5 seconds to the ground station. The balloons ascent with a vertical velocity of about 5 m/s. Thus, profiles which a height resolution of about 25 m get recorded up to the burst point of the balloons in a height typically between 30 and 35 km.

Normally, one balloon ascent gets performed about 12 UTC. The measurements are coded (FM35, BUFR) and transferred directly to the Global Telecommunication System (GTS) by email where they contribute to weather forecasting.