Hong Kong Braces as Low-Pressure System Eyes South China Sea Next Week
SingTao · 1 SOURCESabout 2 hours ago2 MIN
Summary
The Hong Kong Observatory announced on September 14 that a broad low-pressure trough is expected to gradually approach the Guangdong coast during the middle to latter part of next week, with the possibility of a low-pressure zone forming over the northern South China Sea . According to the Observatory, if sea surface temperatures in the northern South China Sea remain warm and atmospheric conditions such as weak vertical wind shear and upper-level divergence align, the low-pressure area could further develop into a tropical cyclone or stronger . However, major forecast models currently show significant discrepancies in their predictions for the system's behavior .
Key Points
- A broad low-pressure trough is forecast to affect the northern South China Sea and waters east of Taiwan by mid-to-late next week
- Two conditions must align for development: warm sea temperatures in the northern South China Sea combined with weak vertical wind shear and upper-level divergence
- The European model predicts the potential tropical cyclone in the South China Sea would form further west and move westward toward the Leizhou Peninsula and eastern Hainan
- The European AI model suggests the South China Sea system may interact with another potential system in the East China Sea, pulling it northeastward toward western Guangdong
- The US model indicates the system would form further east in the South China Sea and move northwest toward eastern Guangdong and the Pearl River Estuary
Why It Matters
The divergent forecasts underscore the inherent uncertainty in tropical cyclone prediction, particularly regarding systems that could directly impact Hong Kong and the broader Guangdong region . If two low-pressure systems develop simultaneously in the South China Sea and East China Sea, they would compete for atmospheric and oceanic energy, potentially altering their intensities and trajectories, which adds another layer of complexity to next week's weather outlook .
The divergent forecasts underscore the inherent uncertainty in tropical cyclone prediction, particularly regarding systems that could directly impact Hong Kong and the broader Guangdong region . If two low-pressure systems develop simultaneously in the South China Sea and East China Sea, they would compete for atmospheric and oceanic energy, potentially altering their intensities and trajectories, which adds another layer of complexity to next week's weather outlook .