More than double that amount came down — the Hong Kong Observatory said that 158.1 mm (6.2 inches) of rain fell at its headquarters between 11 p.m. and midnight, according to the South China Morning Post.
JUST IN: Hong Kong just recorded its heaviest hourly rainfall on record with 158.1 mm [6.2 inches] between 11 PM and midnight (HKT). Records date back to 1884 (139 years ago). A rare “Black Rainstorm Warning Signal” has been issued by the HKO observatory. pic.twitter.com/KWtyWbqUmd
— Nahel Belgherze (@WxNB_) September 7, 2023
In other parts of Hong Kong — Kowloon, the northeastern New Territories and Hong Kong Island — more than 200 mm (7.87 inches) of rainfall was recorded between 6 p.m. and midnight, the paper reported.
Photos and video shared on social media showed flooded streets and inundated subway stations.
The city government will make an announcement Friday morning whether it is safe for roads and public transport to be used and whether offices and schools will be allowed to open.
Heavy rain was also reported in southern China, including in Shenzhen, which was reportedly readying to discharge water from its reservoirs, potentially worsening flooding in parts of northern Hong Kong.
The region has been battered by two typhoons in two weeks, with Saola and Haikui wreaking havoc across southern China and Taiwan.