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Diagnostic Analysis of the Circulation and Physical Quantities of Thunderstorm Gales in Guangxi

ZHONG Lihua ZENG Peng LI Yong XIONG Wenbing HU Zongyu Guangxi Meteorological Science and Technology Service Center,Nanning 530022  
Based on the observation data and ECMWF analysis data,the 45 samples of thunderstorm gales occurring during 2006 to 2008 in Guangxi have been statistically analyzed and the influence model is analyzed by using the synoptic meteorology method.The physical significance of stability index and dynamic parameters,and the environment characteristics of the thunderstorm gale occurring area have been discussed in terms of the thunderstorm gale occurrence conditions.The results show:(1) There are 4 weather model types that can cause thunderstorm gales in Guangxi,including the type of plateau trough,the type of typhoon trough,the type of western subtropical high,and the type of North China trough;(2) Thunderstorm gale occurs mostly in July and August especially in the afternoon,whose peak appears at about 16 p.m.(3) The terrain is important for local thunderstorm gale occurring;(4) Before the thunderstorm gale occurring,the unstable energy in the atmospheric stratification congregates in most areas of Guangxi,the moisture convergence in lower layers and the relative humidity are powerful.The vertical ascending movement and the positive vorticity center of the plateau trough type,the western subtropical high type and the North China trough type are located in northern Guangxi,while the type of typhoon trough is located in southeastern Guangxi;(5) The atmospheric stratification is more unstable in the thunderstorm gale occurring,moisture convergence in lower layers and the cyclonic convergence in the middle and lower layers are also stronger.
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