The Cause Analysis of a Strong Heavy Rainfall in Liuzhou, Guangxi Province in June 2007

In this paper,circulation background and mesoscale systems of a heavy rainfall occurred in Liuzhou,Guangxi province have been analyzed by using the conventional data,denser precipitation data,1°×1° 6 h data from NECP and hourly satellite data.The results show that the circulation configuration in lower and higher level formed a favorable large scale environment for rainstorm occuring,and the mesoscale convective cloud cluster caused by mesoscale cyclonic disturbance directly influenced the heavy rain.Moreover,the convergence of water vapor transportation closely related with the variation of mesoscale disturbance and lower level jet,which made instability energy for heavy rainfall also.The water vapor source of the heavy rainfall may be mainly in the South China Sea.