China's president has called for "all out" rescue efforts after storms in southern and central China killed at least 17 people, injured hundreds more and forced the evacuation of tens of thousands of residents.

Intense rain and severe flooding from Typhoon Maysak killed at least six people in southern region Guangxi, where authorities raised the flood control emergency response to its highest level in the capital, Nanning.

Video shared by state broadcaster CCTV showed a torrent of muddy water rushing past the crumbled concrete walls of a burst reservoir dam.

At least 130,000 people had been evacuated but 11 were still missing, according to regional officials.

Meanwhile, thunderstorms and gale-force winds killed another 11 people and injured more than 330 in central province Hubei, according to state news agency Xinhua.

Almost 5,000 homes have been damaged there and 22 have collapsed.

In a flooded Guangxi town, up to 900 snakes escaped when a breeding farm washed away, Wu Zhi, the head of a local village committee, told state-owned media Red Star News.

Videos of villagers frantically trying to catch the snakes in knee-deep floodwater have gone viral on social media.

No let-up in extreme weather

More heavy rain is expected to hit parts of Guangxi's coastal and eastern regions today, as well as south-western Guangdong, according to Water Resources Minister Li Guoying.

"Due to the impact of persistent heavy rainfall and the prolonged passage of floodwaters at high levels, the safety of reservoirs and embankments in the affected areas faces a severe test," Mr Li said.