The observatory on Thursday said it will issue the Standby Signal Number 1 if a low-pressure area in the central to northern part of the South China Sea develops into a tropical depression.

The forecaster said the low-pressure area is still loosely organised but may intensify. It is expected to move towards the coast of western Guangdong, near the Pearl River Estuary.

It added that there will be showers, thunderstorms and strong winds in the coming days, while offshore winds will also strengthen.