1977年8月1日晚至2日晨,在西起内蒙鄂托克旗、东至山西偏关,保德狭长地带下了一场特大暴雨(简称为“778”乌审旗暴雨)。暴雨的强中心,位于毛乌素沙漠南缘内蒙乌审旗呼吉尔特公社。经过反复调查,发现有几个地点在八至十小时内降雨深度高达1000至1400毫米。雨量之大创世界记 On the evening of August 1, 1977, on the morning of the 2nd, an extremely heavy rain (referred to as “778” Wushen Banner torrential rains) was carried out in the area from the Etuoke Banner in the west to the Piedmont Banner in the east and the strip in the Baode Strip to the east of Shanxi Province. Heavy rainstorm center, located in the southern edge of the Mu Us Desert Inner Mongolia Wushen Qi Hugerte commune. After repeated investigations, it was found that there were several locations with rainfalls of 1,000 to 1,400 mm in eight to ten hours. Rainfall hit the world record