The combination of the stalled frontal boundary and abundant moisture from the monsoon across Indochina has led to days of heavy rainfall in southern China.
The flooding has claimed at least 26 lives in southern China, with more people still missing according to the Associated Press.
An estimate of 337,000 people have been evacuated from their homes with 115,000 needing urgent relief supplies, according to China's Ministry of Civil Affairs.
The hardest-hit regions extend from Guangxi and Guangdong northeastward through Hunan, Jiangxi, northern Fujian and Zhejiang.
Quzhou, in Zhejiang province, reported more than 325 mm (13 inches) of rain since Friday.
Flooding and mudslides across these provinces have damaged or destroyed nearly 75,000 homes.
The heaviest rain through Tuesday will fall across Zhejiang, northern Fujian and eastern Jiangxi provinces.
Another round of heavy rain will occur later this week from Hunan province into Zhejiang province and the Shanghai municipality.
This round of heavy rainfall will bring 50-100 mm (2-4 inches) to most locations with local amounts over 200 mm (8 inches) leading to a high risk for more dangerous flooding.