Shanghai issues blue alert for heavy rain.

Shanghai Central Meteorological Observatory issued a blue rainstorm warning [Level IV/General] at 21:45 on July 17th: It is expected that in the next 6 hours, the hourly precipitation in the central urban area of the city, Songjiang, Minhang, and the central and northern parts of Pudong New Area will exceed 35 millimeters. Please pay attention to preventing urban waterlogging caused by heavy rain, and do a good job in drainage and flood prevention in low-lying and flood-prone areas.