At 12:40 on August 4th, Ali Meteorological Observatory issued a blue warning signal for heavy rainfall: due to the influence of wind convergence shear, it is expected that from 17:00 on the 4th to 17:00 on the 5th, there will be moderate to heavy rain (17-38 millimeters) in the northeast and south of our region, as well as in the central and southwestern parts of Cuoqin; There will be light to moderate rain (5-17mm) in the central and western regions and the eastern part of Cuoqin; Other areas will be mostly cloudy with light rain/thunderstorms. Defense measures: 1. This precipitation weather process has strong local characteristics and overlapping precipitation areas. It is necessary to prevent secondary disasters such as flash floods, mudslides, rising water levels of small and medium-sized rivers, and urban and rural waterlogging that may be caused by heavy precipitation. 2. Prevent the adverse effects of heavy rainfall weather on major construction projects, transportation, outdoor workers, etc.