Abstract: A severe thunderstorm affected Delhi and adjoining region between 1630 hrs IST and 1730 hrs IST of 30th May 2014. Weather Research and Forecasting (WRF) system version 3.6.1 has been used to simulate and investigate the severe thunderstorm. Sensitivity experiments are conducted to study the impact of using different grid resolution (9km and 3km) with terrain resolution 5 min (~10 km) and 1 min (~2 km) respectively and the same microphysics (MPs) and cumulus parameterization (CPs) schemes on the simulation of the system. The results demonstrate that the model simulates better structure and intensity of the thunderstorm at higher resolution domain.