强沙尘暴发生在200hPa高空急流中心前部的出口区右侧。
Intensesand storms occur in the right side of the front area of front part of 200hPa upper air jetstream center.
高空急流轴倾斜以及急流出口区右侧强辐散场的出现要早于暴雨的发生。
The incline jet axis and strengthened convergence happen earlier than the rainfall does.
在东风急流的入口区和出口区存在两个近于相反的垂直环流，它们与降水分布密切有关。
There are two opposite vertical circulations in the entrance region and exit region, which is closely associated with the distribution of rainfall.
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