暴雨、大暴雨，要来了！一地紧急通知：停课，非必要不外出！

Core Points - The Central Meteorological Observatory issued a yellow rainstorm warning, predicting heavy to torrential rain in several regions including Henan, Shandong, and Anhui from September 11 to 12, with some areas expecting rainfall between 100 to 180 millimeters [2][4] - Zhengzhou has initiated a level four emergency response due to the forecast of heavy rain, with the most intense rainfall expected between 11 AM and 2 PM on September 11 [6][11] - All non-boarding primary and secondary schools in Zhengzhou will be closed on September 11, and citizens are advised to avoid unnecessary outdoor activities [10][12] Weather Alerts and Precautions - The government and relevant departments are advised to prepare for the rainstorm, including traffic management and safety measures for vulnerable areas [4][11] - High-risk areas for urban flooding in Zhengzhou include low-lying regions, underpasses, and underground facilities, particularly during the peak rainfall period [8][9] - Citizens are urged to stay indoors and avoid outdoor work during the rainstorm, with construction sites and deep excavation projects required to halt operations [12]