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.
而今天，仅剩区区三个谷物出口区了：北美、澳大利亚和新西兰。
Today, only three major grain exporters remain: North America, Australia and New Zealand.
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.
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