This folder includes the intermediate data and scripts (of plots in the main text) for the following manuscript: Chen et al., Sharpening of Cold Season Storms over the Western US. The simulations are done using WRF V3.8 at PNNL. A historical simulation ("NARR") is done for 1981-2010, and five future simulations ("CanESM2", "CESM1-CAM5", "GFDL-ESM2M", "HadGEM2-ES", "MPI-ESM-MR") are done for 2041-2070 using the Pseudo Global Warming (PGW) approach. For the WRF model configuration and the simulation details, please refer to the abovementioned manuscript and Chen et al. (2018). The precipitation objects are then identified using the 5 mm/day threshold. The paths in the scripts are self-consistent. You can just download the .zip file and run the Jupyter notebook to reproduce the figures in the paper. Reference: Chen, X., L. R. Ruby, Y. Gao, Y. Liu, M. Wigmosta, and M. Richmond (2018), Predictability of Extreme Precipitation in Western U.S. Watersheds Based on Atmospheric River Occurrence, Intensity, and Duration, Geophys. Res. Lett. doi: 10.1029/2018GL079831 Chen, X., L. R. Ruby, Y. Gao, Y. Liu, and M. Wigmosta (2023), Sharpening of cold-season storms over the western United States, Nat. Clim. Change. doi: 10.1038/s41558-022-01578-0