Sea breeze fronts always form in the coastal northern Weifang, Shandong Province. The superposition of the sea breeze fronts and mesosystem could make the system stronger. This is an important reason that in northern Shandong province severe convection appears frequently. An analysis of a cold front process indicates that the superposition is conductive to form a stronger wind area. The D,ζ over the front could accelerate the upward vertical movement. The relevant high energy areas near the surface provided the energy. A nowcasting equation of the track is developed by analyzing 21 severe convection events.