Analysis of different types of severe convective weather cases under the same large-scale circulation

Using conventional meteorological data, Doppler weather radar data, satellite images and observations from automatic weather stations, we analyzed two types of regional severe convective weather events (a dry convection and a mixed convection) occurred in Guangxi on 23 March 2013, focusing on their local environmental conditions, trigger mechanisms and mesoscale characteristics. The results show that under the same large-scale circulation, local environmental conditions of the dry convection are different from that of the mixed convection, asindicated by their different atmospheric stratification, wet thickness, convective available potential energy (CAPE) and vertical wind shear. The dry convection in western Guangxi is triggered by a convergence line located in the warm zone in front of the surface front, while themixed convection in northern Guangxi is triggered by the surface front. In radar echo charts and satellite images, the difference in such features as shape, intensity and moving speed is evident between the two types of severe convective events, which can be certainly served as a reference for the monitoring and early warning of different types of severe convective weather phenomena in Guangxi.