Data for "How does the Precipitation Structure of Landfalling Tropical Cyclones Change due to Extratropical Transition?"

This citation provides the following for Mullinix et al. (2026): mullinix.tar.gz: processed tropical cyclone-relative GridRad data, version 3.1.1, used for each radar volume included for pre-ET, during ET, and post-ET; era5_ecape_srh_composite.nc: processed tropical cyclone-relative GridRad data, version 3.1.1, used for the paper containing entrainment CAPE and 0-1-km storm-relative helicity; Mullinix_etal_2026_Figures.ipynb: Python Jupyter notebooks used to further process and plot the data from mullinix_data.tar.gz and era5_ecape_srh_composite.nc. Please contact [e-mail] for any questions or comments. Citation: Mullinix, S. A., B. A. Schenkel, R. N. Mendeke, J. Ruppert, M. C. Brown, C. Homeyer, T. J. Galarneau, and K. M. Wheeler, 2026: How does the Precipitation Structure of Landfalling Tropical Cyclones Change due to Extratropical Transition?, Geophys. Res. Lett., submitted. Abstract: Almost half of landfalling Atlantic tropical cyclones (TCs) in the United States undergo extratropical transition (ET), yet knowledge of their typical precipitation structure remains incomplete. Therefore, this study examines the impacts of ET on landfalling TC precipitation structure and type in the U.S. using a multi-decadal radar dataset. We found that TC inner-core reflectivity weakens, shallows, and moves radially outward and preferentially downshear left in association with ET. ET is also associated with a strengthening and expansion of TC outer-region reflectivity downshear left despite less favorable convective-scale environments, while eroding reflectivity downshear right. Classification of reflectivity into precipitation types shows that stratiform is the dominant precipitation type, regardless of ET phase. As ET progresses, precipitating stratiform becomes increasingly dominant as TC inner-core convection erodes and precipitation extends downshear left. The remaining TC outer-region convection becomes more strongly concentrated downshear right, where convective-scale environments remain supportive for it.