The Hong Kong Observatory said it will consider issuing a tropical storm warning in the next couple of days, as Super Typhoon Saola is expected to enter within 800 kilometres of the SAR on Wednesday.

The forecaster said while the typhoon will edge closer towards the coastal area of eastern Guangdong to southern Fujian, its subsequent movement remains highly uncertain as it may be affected by Tropical Cyclone Haikui located to its east.

The current forecast track shows Saola coming very close to Hong Kong on Saturday morning.

"Saola may move westwards along the coastal waters of Guangdong or weaken over the inland areas of southeastern China," the observatory said.

Saola, named after a rare and protected animal species discovered in Vietnam, was centred about 500 kilometres southeast of southern Taiwan at 4pm on Tuesday.