Zhang Ling, chief forecaster with the CMA, said that Mangkhut intensified into a super typhoon on Tuesday with sustained winds of 234 kilometers per hour near the center after being tracked in the Pacific on Sept 7.

People in southern parts of China and the Hong Kong and Macao special administrative regions, will be at the most risk.

The typhoon's massive raincloud band reaches 1,000 kilometers and will bring strong wind and intense rains to the areas, according to the authorities.