The NWP system, known as 4DWX (Four-Dimensional Weather System), uses the Weather Research and Forecasting (WRF) Model as its predictive core and assimilates data through the Four-Dimensional Data Assimilation (FDDA) system. Lightning potential is predicted for each cell in 4DWX's computational grid, based on a fuzzy logic algorithm applied to simulated ice water path and to simulated updraft volume. Initial testing of this approach was based on a configuration of 4DWX that included the microphysical scheme developed by Lin et al.(1983). The authors are now exploring other model configurations to characterize how they affect predictions of lightning potential. The presentation will review results from several recent case studies.