Flood in the west of Sichuan Basin is associated with the circulation pattern that two ridges located Ural and the East of Asia respectively, and a trough between Balkhash and Baykal.

• 川西地区的涝年与中高纬 5 0 0hPa的乌拉尔山高脊、巴尔喀什湖至贝加尔湖之间的低压槽以及亚洲东部的高脊的两脊一槽环流型密切相关 ,在这种环流型下有利于川西地区降水偏多。