The authors thank Dr. Urs Germann and Marco Boscacci of MeteoSwiss for providing operational radar data products. We also thank the European Centre for Medium-Range Weather Forecasts (ECMWF) for providing free internet access to ERA-Interim reanalysis data (http://data-portal.ecmwf.int/data/d/interim_full_daily/) and MeteoSwiss for weather station data from the IDAWEB portal (https://gate.meteoswiss.ch/idaweb). This research was supported by National Science Foundation Grant AGS-0937035 and the University of Colorado at Boulder, Department of Atmospheric and Oceanic Sciences. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsors, partners, and contributors.
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