BEIJING — The death toll from a powerful typhoon sweeping across China’s east coast rose to 30 on Sunday, with at least 18 still missing, after torrential downpours forced over one million to leave their homes, the state news media reported.

Nearly five million people in Zhejiang Province have been affected by the storm, Typhoon Lekima, which made landfall early Saturday, according to the reports. Many of the deaths occurred in Yongjia County, near the city of Wenzhou, when the collapse of a natural dam set off a flash flood that swept away several people, said CCTV, the state-run broadcaster.

The typhoon, which packed winds of up to 116 miles per hour, caused major travel disruptions across the region, including in Shanghai, with thousands of flights canceled and train operations suspended. Shanghai Disneyland was closed on Saturday.