Core Points - Continuous heavy rainfall is expected in the western and southern regions of China, with significant risks of secondary disasters such as flash floods and geological hazards [1][2][4] - The South China Sea tropical depression will impact the northern waters and southern regions, necessitating precautions for maritime activities and urban safety [1][4] Group 1: Weather Forecast - From September 18 to 22, eastern Northwest China, southwestern North China, Huanghuai, and the Sichuan Basin will experience moderate to heavy rain, with some areas facing torrential rain [2][5] - Specific regions such as southeastern Gansu, southern Shaanxi, and eastern Sichuan Basin may see rainfall between 100 to 240 millimeters, with localized heavy downpours exceeding 70 millimeters [2][5][7] Group 2: Wind Conditions - The northeastern South China Sea will experience winds of 6 to 7 levels, with gusts reaching 8 levels, and some areas may see winds of 8 to 9 levels and gusts of 10 to 11 levels [4][5] - The Taiwan Strait and Bashi Channel will have winds of 5 to 7 levels, with gusts reaching 8 levels [5][9]