Abstract
Data taken by aC-band conventional weather radar during 1979, 1980 and 1981 summer campaigns conducted in the western Po Valley, have been analysed in comparison with surface reports of hailfalls, indicating the location, time and estimated losses for each event. The aim of this paper is to determine the signature of thunder-storms on radar data,vs. the presence or absence of hail on the ground. Hail percentages of occurrence greater than 75% of all cases are experienced when reflectivity values of 55 dBZ are detected above 8000m. Detection criteria of this kind are easy to implement in real-time surveillance systems and can be used to elaborate short-time warnings.
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