This repository contains the Python scripts that were used for the large sample nowcasting evaluation in the publication of Imhoff et al. (2020). The repository contains three main folders: pysteps, rainymotion and HPCrunScript. The first two folders contain the model configurations of pysteps (Pulkkinen et al., 2019) and rainymotion (Ayzel et al., 2019) as used in this study. See also https://github.com/pySTEPS/pysteps and https://github.com/hydrogo/rainymotion for the latest versions of these nowcasting algorithms. Other than applied in the original distributions of these algorithms, the folders also contain a 'catchment_slice.py' script which saves the nowcasting outputs clipped to the given catchment extents, as based on provided shapefiles. This step is implemented to lower the data storage, since the focus of this study was on the use of nowcasting for hydrological basins and polder areas. The scripts can be found in ./pysteps/pysteps/utils/ and ./rainymotion/rainymotion/.