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A COMPOSITE ANALYSIS OF THE SOUTHWEST VORTEX

Huang Fujun(Sichuan Provincial Meteorological Bureau)  
In this article, six Sichuan heavy-rain processes which were caused by southwest vortex in May-September, 1983 are analysed by using Reed's composite method. The average flow field of the vortex and the average characteristics of vorticity, divergence and vertical velocity are made out. The appearance of Sichuan heavy rains is closely associated with the development of southwest vortex. In the development of the vortex, there exist three branches of air flows in the upper and lower troposphere, which are compared with those in the heavy rain region onthe east side of Rocky Mountains.
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