Shanghai issues a blue rainstorm warning signal.

Shanghai Central Meteorological Observatory issued a blue rainstorm warning signal at 17:30: It is expected that there will be a cumulative rainfall of more than 50 millimeters in the city in the six hours before tomorrow morning. Please pay attention to preventing urban waterlogging caused by strong rainfall and do a good job in drainage and flood prevention in low-lying and flood-prone areas. Currently, Shanghai has raised the three warnings of "thunderstorm yellow + strong wind yellow + rainstorm blue", please be vigilant.