The observatory on Monday said the chances of it issuing a T3 over Severe Tropical Storm Man-yi are not high, because winds across the city are not expected to get so strong.

"Unless Man-yi adopts a more northerly track or edges closer to the coast of Guangdong with a higher intensity, the chance of issuing Strong Wind Signal No 3 is relatively low," said the observatory.

It added that the T1 issued in the morning will remain in place until at least 10am on Tuesday.

Although Hong Kong is expected to be spared the worst of the storm, showers are likely to become more frequent on Tuesday and some minor flooding is possible in low-lying areas over the next two days, forecasters said.

Man-yi is expected to skirt around 400 kilometres to the south of the SAR on Tuesday morning.