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In this work we designed and developed a cluster of light expendable radiosondes that can float passively inside warm clouds to study their micro-physical processes. This involves the tracking of both saturated and unsaturated turbulent air parcels. The aim of this new kind of observation system is to obtain Lagrangian statistics of the intense turbulence inside warm clouds and of the lower intensity turbulence that is typical of the air surrounding such clouds. Each radiosonde in a cluster includes an electronic board, which is mounted onto a small, biodegradable balloon filled with a mixture of helium and air. The cluster is able to float inside clouds for a few hours and to measure air temperature, pressure, humidity and the associated position, velocity, acceleration and magnetic field readings of each radiosonde along their trajectory. • In-field measurement system based on a cluster of radiosondes for studying physical processes in warm clouds. • Each radiosonde is able to track turbulent air parcels inside clouds and their surroundings. • Radiosondes measure temperature, pressure, humidity, and provide trajectory data. • Field tests conducted to validate sensor readings against reference values. [ABSTRACT FROM AUTHOR]