Overview

• The Hong Kong Observatory issued a black rainstorm signal first at 11:45 p.m. on August 4 and reissued it at 5:50 a.m. on August 5 as heavy monsoon rains intensified.
• The warning persisted for 11 hours and 15 minutes, making it the second-longest continuous black rainstorm alert in the city’s history.
• Officials cautioned that hourly rainfall could exceed 100 millimetres in areas including Tseung Kwan O, heightening flood risks in low-lying districts.
• Classes were suspended and temporary shelters opened as public transit slowed and several subway exits closed.
• More than 100 flights were delayed, two cancelled, and emergency room services at Queen Mary Hospital were disrupted by waterlogged roads.