We thank Tom Hamill, Tilmann Gneiting, Constantin Junk, and an anonymous reviewer for their valuable comments that helped to improve this manuscript. This study was supported by the Austrian Science Fund (FWF): L615-N10. The first author was also supported by a Ph.D. scholarship from the University of Innsbruck, Vizerektorat für Forschung. Data from the ECMWF forecasting system were obtained from the ECMWF Data Server.
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