Autumn Winds Arrive as Weekend Storm Threat Looms Over Hong Kong
HK01 · 2 SOURCESabout 3 hours ago2 MIN
Summary
The Hong Kong Observatory announced on September 9 that a northeast monsoon is bringing cooler and drier weather to southern China, with morning temperatures expected to drop slightly over the next two days. While the early week saw calm winds over Guangdong, the September 9 surface weather charts show the northeast monsoon influencing coastal regions, giving residents a taste of autumn weather. However, as the weekend approaches, conditions are set to change as a broad low pressure system develops in the central South China Sea.
Key Points
- Morning temperatures on September 10 dropped to around 26 degrees Celsius, with daytime highs reaching 32 degrees and humidity falling to as low as 55 percent
- A thunderstorm warning was issued at 2:05 AM on September 10, valid until 4:00 AM, warning of localized thunderstorms over the New Territories
- Computer models including the European AI model and American model predict the low pressure system will move toward Hainan Island and waters south, remaining at a safe distance from Guangdong
- The convergence of the northeast monsoon with the low pressure system's outer winds will cause stronger winds and showers with thunderstorms across Guangdong from Saturday through Sunday
- Historical precedent includes Typhoon Lekima in late September to early October 2007, which caused strong winds and high seas in Hong Kong when it approached Hainan Island
Why It Matters
The dual influence of the northeast monsoon and the developing South China Sea low pressure system creates unpredictable weather conditions that could affect maritime operations, outdoor events, and daily life across Hong Kong . The uncertainty in the low pressure system's development trajectory means the Observatory may need to issue a Strong Monsoon Signal, similar to past cases, to warn the public of potential hazards at sea and along coastlines .
The dual influence of the northeast monsoon and the developing South China Sea low pressure system creates unpredictable weather conditions that could affect maritime operations, outdoor events, and daily life across Hong Kong . The uncertainty in the low pressure system's development trajectory means the Observatory may need to issue a Strong Monsoon Signal, similar to past cases, to warn the public of potential hazards at sea and along coastlines .