DRIHM, the Distributed Research Infrastructure for Hydro-Meteorology, together with its US facing companion project, DRIHM2US, is a prototype research infrastructure for simulating extreme hydro-meteorological events such as flash flooding. Both projects enabled a step change in how scientists can approach studying high impact weather events: more functionality, more efficiency and faster results. 

See the corresponding success story at
https://ec.europa.eu/digital-agenda/en/news/simulating-extreme-hydro-meteorological-events-project-drihm2us