The authors are grateful to Prof. R. Steinacker from the Institute of Meteorology and Geophysics (University Vienna) for allowing duplication of the orographical map of the alpine region, as presented in Fig. 1, and to W. Henrich from the Institute of Atmospheric Science (ETH Zürich) for modifying this map as desired. Many thanks also to the data providers: Swiss Meteorological Institute and the Swiss Hail Insurance Company. We would like to thank Frank Mair for a thorough and careful reading of the manuscript.
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