Based on the echo data of the Yichang WSR-98D S- band Doppler weather radar, a severe storm with 28.8 m·s ^-1 maximum instantaneous wind speed at the Three Gorge Dam Area on 2 July 2001 is analyzed. The result shows that, under the condition of environmental southerly airflow field, there was a meso-scale convergence line on the southern slop of the Shennongjia Mountain, the convective clouds developed near the convergence line, then moved northeastward along the eastern slop of the Shennongjia Mountain, and affected the Three Gorge Dam Area. It suggests that the upwind airflow surge at the southern slop of the Shennongjia Mountain triggered and maintained the severe storm in some degree.