The Ministry of Water Resources on Friday warned that some rivers in Hainan and Guangdong provinces could see floods exceeding alert levels due to Super Typhoon Yagi.
From Friday to Saturday, the Nandu River and Changhua River in Hainan, and Jianjiang River and Moyang River in Guangdong could swell as heavy rainfalls brought by the typhoon are expected to lash parts of south China, according to the ministry.
The ministry said it will closely monitor the typhoon and floods, providing guidance to the local authorities on preventive efforts.
Yagi, the 11th typhoon of the year, made landfall in Wenchang City in Hainan on Friday afternoon, packing winds exceeding 234km per hour.
It brought heavy rain across most of the island.
More than 400,000 people were evacuated in Hainan province ahead of the storm's landfall, while in Guangdong, more than 570,000 residents were relocated. (Xinhua and agencies)