This is a sandstorm weather that happened on zonal circulation and affected by heat low and surface cold front in west Mongolia.
通过分析认为，这是一次发生于纬向环流中的沙尘暴天气，主要影响系统是蒙古西部热低压和地面冷锋。
The sky may clear very abruptly, even before the passage of the surface cold front in some cases, although with kata-cold fronts the changes are altogether more gradual. 3.
天空会突然放晴，有些情况下，甚至在地面冷锋过境前就放晴了，虽然下滑锋的变化总的来说要缓和得多。
This pattern is consistent with the passing of a cold weather front bearing a strong area of low pressure at the surface.
沙尘暴的这种分布型式与地面冷锋造成的强低压区相一致。
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