Hong Kong black rainstorm conditions caused widespread disruption on Thursday after the city issued its second highest level rain warning of the year. The alert led to flight delays, school suspensions, transport interruptions, and flooding across multiple districts, particularly in the northern New Territories.
The Hong Kong Observatory raised the black rainstorm signal at 12.55 pm, warning that very heavy rainfall had fallen or was expected across the territory. The alert indicates rainfall exceeding 70 millimetres in an hour, which can quickly lead to flash flooding and dangerous conditions in low lying areas.
Hong Kong Observatory said the warning would remain in force for several hours as intense rain continued to affect the region. It marked the second time this year that the highest level rainstorm warning had been issued, following a similar alert in early June.
The Education Bureau suspended afternoon school sessions as a precaution, while schools already in operation were instructed to continue classes but ensure safe conditions before students returned home. Parents were advised to monitor updates and avoid unnecessary travel during the storm.
Heavy rainfall caused flooding in several northern districts including Yuen Long, Sheung Shui, Kam Tin, and Pat Heung. Videos shared on social media showed submerged roads, stranded vehicles, and rising water levels in drainage channels. In some areas, floodwaters reached near road level, creating hazardous conditions for residents and commuters.
Authorities also issued a landslip warning later in the afternoon, urging the public to stay away from steep slopes and retaining walls. Residents were advised to avoid non essential travel, remain indoors where possible, and report any signs of ground movement or slope instability to emergency services.
Transport services were significantly affected across the city. Several MTR station exits were closed due to flooding risks, while bus and minibus routes were suspended or diverted. Some services in the New Territories were disrupted due to waterlogged roads and reduced visibility.
Emergency services and transport operators worked to manage the situation, with adjustments made to routes and schedules to maintain essential mobility where possible. Commuters were advised to expect delays and avoid flooded areas.
The Agriculture, Fisheries and Conservation Department urged the public to stay away from country parks and hiking trails during the storm. Visitors already in affected areas were asked to leave immediately or seek safe shelter until conditions improved.
Despite the severe weather, some public services such as childcare and elderly care centres remained open to provide essential support. Authorities emphasized that safety measures were in place to protect vulnerable groups during the disruption.
Meteorologists said rainfall was especially intense in Tuen Mun and Yuen Long, where hourly precipitation exceeded dangerous thresholds. These areas were among the hardest hit by flash flooding and drainage overflow.
Forecasters also warned of continued unstable weather before conditions gradually improve. Sunny intervals are expected to return later in the week, followed by hotter weather and occasional showers across southern China.
The storm coincides with the Tuen Ng Festival holiday period, which is expected to create additional travel pressure as residents plan a long weekend. Authorities advised caution for outdoor activities due to lingering wet conditions.
Experts say Hong Kong’s dense urban environment and steep terrain make it particularly vulnerable to flash floods during extreme rainfall events. Drainage systems can quickly become overwhelmed during high intensity storms.
The Observatory reminded the public that black rainstorm signals are issued when extreme rainfall poses serious risks to life and property. Residents are urged to stay alert, avoid flood prone areas, and follow official safety instructions until the warning is lifted.
