High resolution Earth system modeling offers significant opportunities for improving the quality of simulations, particularly for water cycle processes and extreme events. Increase in model resolution and complexity presents significant challenges on many fronts. These include evaluation, diagnosis, and analysis of model simulations, as well as uncertainty quantification, computational performance, and model initialization and data assimilation. This session aims to bring together scientists who develop, run, evaluate, and analyze coupled global and regional Earth system models and their components at high resolution on high performance computers. With submissions particularly encouraged on ~10 km and ultra-high (order km) scales, this session welcomes contributions on development of parameterizations to improve model components and the coupled system at these resolutions. The session also encourages presentations on high-resolution simulations from model intercomparison projects such as HighResMIP, DYAMOND, and OMIP, as well as development of observational datasets and metrics for evaluation of such high-resolution simulations.