Shanghai launches city-wide level four flood and typhoon response action.

In the next 6 hours, most areas of this city are expected to experience short-term heavy rainfall with hourly precipitation of over 35 millimeters. The Shanghai Central Meteorological Observatory issued a blue rainstorm warning signal at 12:33 on September 4, 2025. The city's flood control headquarters has decided to simultaneously launch a level four response to flood prevention throughout the city.