The Strong Wing Signal No 3 will be issued between midnight and 3am on Sunday.

This came as a tropical cyclone moves closer to the SAR.

The Hong Kong Observatory does not rule out the possibility of issuing a higher signal on Sunday night.

"According to the present forecast, the tropical cyclone will intensify progressively and skirt around 200 kilometres to the southwest of Hong Kong on Monday morning," said acting senior scientific officer Shum Chi-tai.

The forecaster said the outer rainbands of the tropical cyclone are edging closer to the coast of Guangdong, and its strong winds are expected to affect the vicinity of the Pearl River Estuary gradually on Sunday.