The Hong Kong Observatory hoisted the highest black rain signal twice on Thursday to warn residents of severe flooding risks [1], [2].
The extreme weather triggered widespread disruptions across the city's infrastructure. The repeated issuance of the top-tier warning forced the closure of schools and the halting of business operations to ensure public safety.
According to reports, the black rain signal was first posted at 12:55 p.m. local time [1]. This signal, known as signal 10, represents the most severe level of rainstorm warning used by the observatory [1], [2], [3].
Authorities said residents should take shelter as the intense rainfall threatened to overwhelm drainage systems. The weather event caused significant logistical challenges, including the diversion of flights and the suspension of various public services [1], [2], [3].
Because the signal was hoisted twice [2], the city faced a prolonged period of instability. The observatory monitored the conditions closely to manage the risk of flash floods and landslides in high-risk areas.
Public transportation and commerce were heavily impacted as the city adhered to the safety protocols associated with the black rain signal. Residents were advised to stay indoors and avoid all unnecessary travel until the warnings were downgraded [1], [3].
“The Hong Kong Observatory hoisted the highest black rain signal twice on Thursday”
The repeated issuance of a signal 10 warning indicates an extraordinary meteorological event for Hong Kong. By shutting down schools and diverting flights, the city demonstrated a prioritize-safety approach to mitigate the high risk of urban flooding and casualties associated with extreme precipitation.
