To the report (PDF) (in german)
Piper, D., Kunz, M., Ehmele, F., Mohr, S., Mühr, B., Kron, A., and Daniell, J.: Exceptional sequence of severe thunderstorms and related flash floods in May and June 2016 in Germany. Part I: Meteorological background, Nat. Hazards Earth Syst. Sci., 16, 2835-2850, https://doi.org/10.5194/nhess-16-2835-2016, 2016.