Severe Tropical Storm Ma-on will be closest to Hong Kong tomorrow morning and will skirt within 200 kilometres to the south-southwest of the territory.

At 9 pm, Ma-on was centred about 260 kilometres south-southeast of Hong Kong and is forecast to move west-northwest at about 28 kilometres per hour in the general direction of the coast of western Guangdong.

According to the weather forecast for tonight and tomorrow, there will be strong to gale force east to northeasterly winds, occasionally storm force on high ground. Winds will become southeasterlies tomorrow morning. Showers will be heavy at times tomorrow.

Seas will be very rough with swells. Public members are advised to stay away from the shoreline and not to engage in water sports.

Under the influence of storm surge and astronomical high tide, a high water level of around 3 metres above chart datum, or about 1 metre above the normal tide heights, is expected at Quarry Bay between 5am and 9am tomorrow. The high water level may cause flooding in low-lying areas.

In the past hour, the maximum sustained winds recorded at Ngong Ping, Waglan Island and Tate's Cairn were 87, 78 and 76 kilometres per hour with maximum gusts 117, 88 and 101 kilometres per hour respectively.

The Education Bureau announced that classes of all schools are suspended on Wednesday. Schools should implement contingency measures to ensure the safety of students.