一九八四年八月黑龙江流域发生了大洪水,黑龙江干流乌云站以下发生有记载以来的历史特大洪水,这次洪水是由于连续多次暴雨或大暴雨形成的,从七月下旬开始,受蒙古西部和北来冷空气影响,黑龙江流域连续降了大雨或暴雨,局部地区出现特大暴雨.七月三十一日一次大暴雨,黑龙江上游的漠 In August 1984 there was a flood in the Heilongjiang River basin. There was a history of major floods recorded below the Cloud Station in the main stream of Heilongjiang. The flood was caused by a series of torrential rains or torrential rains. Since late July, Due to the cold air in the west and north, heavy rain or heavy rain continued to fall in the Heilongjiang River Valley, causing heavy rainfall in some areas. On July 31, a heavy rainstorm led to the desert in the upper reaches of Heilongjiang