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During a 15-day episode from 26 May to 9 June 2016, Germany was affected byan exceptionally large number of severe thunderstorms. Heavy rainfall,related flash floods and creek flooding, hail, and tornadoes causedsubstantial losses running into billions of euros (EUR). This paper analyzesthe key features of the severe thunderstorm episode using extreme valuestatistics, an aggregated precipitation severity index, and two differentobjective weather-type classification schemes. It is shown that thethunderstorm episode was caused by the interaction of high moisture content,low thermal stability, weak wind speed, and large-scale lifting by surfacelows, persisting over almost 2 weeks due to atmospheric blocking.  For the long-term assessment of the recent thunderstorm episode, we drawcomparisons to a 55-year period (1960–2014) regarding clusters of convectivedays with variable length (2–15 days) based on precipitation severity,convection-favoring weather patterns, and compound events with low stabilityand weak flow. It is found that clusters with more than 8 consecutiveconvective days are very rare. For example, a 10-day cluster with convectiveweather patterns prevailing during the recent thunderstorm episode has aprobability of less than 1 %

Exceptional sequence of severe thunderstorms and related flash floods in May and June 2016 in Germany – Part 1: Meteorological background