This will be a joint session between the 6th Symposium on High-performance Computing for Weather, Water, and Climate (6HPC) and the 26th Conference on Numerical Weather Prediction (26NWP). This session will explore the use of high-performance computing to develop, run, enhance the performance of, and post-process output from numerical weather models such as WRF, convection-allowing models, convection-allowing ensembles, etc. Abstract topics may include (but are not limited to) improving computational efficiency, improving scalability, preparing for exascale computing, and optimizing numerical weather models to benefit from the use of specialized hardware in HPC environments, such as graphical processing units (GPUs).