Manuscript files for "Idealized Simulations of Supercell Thunderstorms Near Stationary Boundaries" by Jasen Greco and Dr. Casey Davenport.

All of the BSS, input sounding, and namelist files used for the manuscript submission of "Idealized Simulations of Supercell Thunderstorms Near Stationary Boundaries" by Jasen Greco and Dr. Casey Davenport. <br><b>Abstract of study: </b>Synoptic-scale frontal boundaries are understood to be a source of intensification and severe weather production for supercell thunderstorms, owing to associated convergence and baroclinically-generated horizontal vorticity that can be tilted into the updraft. However, boundaries are also associated with strong spatial gradients in environmental quantities; separately, these variations are also known to influence storm intensity, longevity, and severe weather production. It is unclear whether the boundary circulation and associated vorticity or the rapid changes in the near-storm environment more significantly influence the known enhancements for supercells near boundaries. Thus, the research presented herein explores the contribution of a rapidly changing background environment consistent with a supercell crossing a frontal boundary (without the associated convergence or boundary circulation) via idealized simulations. The outcome from these simulations is designed to aid forecasters by providing a frame of reference for how supercell thunderstorms behave in frontal-boundary environments.The simulations used base-state environments rooted in an observed supercell-stationary boundary event on 29 May 2011. Representative environments were generated from model analyses on the warm-side, cold-side, and on the boundary itself. Idealized model experiments in CM1 tested each of these environments either fixed over time (control simulations), or varying over time via base-state substitution (BSS). Different types of boundary interactions were replicated through changes to the length of the transition between warm, cold, and boundary environments, as well as testing storm initiation on either side of the boundary (i.e., warm-to-cold versus cold-to-warm). While the control simulations indicated that the fixed boundary environment produced the strongest and longest lived supercell, all BSS experiments led to supercell dissipation. Overall, these simulations suggest that the boundary itself (i.e., associated convergence and vorticity) is an important contributor to the maintenance and severe weather production during supercell-boundary interactions. Implications for operations are described to emphasize this study’s applicability to operational forecasting.