On a large-scale average, annual extreme precipitation events intensify due to anthropogenic climate change. This intensification has been established on the basis of observations, theoretical considerations, and climate simulations. On a local scale, however, the evidence is, depending on the location, less conclusive because natural climate variability can exert an influence comparable to recent climate change on annual extreme precipitation events. The evidence is further complicated in some regions by large uncertainties in climate projections of annual extreme precipitation. The AL CAPONE project is conducted in cooperation with ETH Zurich and aims to dynamically constrain uncertainties in regional climate projections of annual extreme precipitation.