China Meteorological Administration (CMA) and the Ministry of Water Resources on Sunday evening jointly issued a warning for mountain floods from Sunday night to Monday night.
The floods are expected to hit the southeastern part of Tibet, the eastern part of Guangdong and, in particular, the western part of Yunnan, according to a statement.
The weather authorities advised close monitoring and precautions.
Meanwhile, a separate statement issued by the Ministry of Land and Resources and the CMA warned of high risks of unspecified geological disasters in western Yunnan from Sunday night to Monday night.
Heavy rain has lashed south China since last week.
