We show how Numerical Weather Prediction works, and which software and data is needed to run your own NWP system. IMPORTANT -> to prepare, please clone the repo https://git.hacknology.de/tecer/wrf-docker and follow the instructions to build the docker images wrf and wrfpp and the docker volume. The images are also available on the docker hub registry: "tcriess/wrf" and "tcriess/wrfpp".