Piotr is a hydrologist. Maybe even a wetland hydrologist. He likes to get his feet wet and measure water in swamps. But he is to do this no more. He has discovered the joys of juggling climate data. Using climate models’ output for hydrological analyses in the context of climate change impact assessment, attribution and seasonal forecasting. Trying to figure out how the uncertainties and errors propagate through the various processing steps, and how to extract useful information out of this somewhat messy business. He bridges the disparate worlds of climate and hydrological modelers.