下图为2001年4月6日17时某区域地面天气图，虚线范围内为图示天气系统引发的某种气象灾害实时分布图。此前图示区域大部分地区表土解冻，地表干燥。阅读图文资料，完成下列各题。
(1)描述图示区域气压分布特点。
(2)判断该气象灾害种类。
(3)分析该气象灾害形成的条件。
正确答案及解析
正确答案
解析
(1)西南和东南部气压高，有高压中心，等压线稀疏，气压梯度小；中部偏北气压低，有低压中心，等压线密集，气压梯度大。 (2)沙尘暴(风沙天气)。
(3)气温回升导致表土解冻，蒸发加强，地表干燥，沙源丰富；冷锋锋前暖气团干燥，难以形成降水；气旋势力强，气流上升，形成扬沙；风力强劲，形成大范围沙尘暴。
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