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About 1.06 million people in 69 townships in Jiangmen and Yangjiang cities were feeling the effect of the storm at 6 p.m., said Guangdong Flooding and Drought Relief Headquarters. One person in Zhuhai City is missing.
In Shenzhen City, 169 flights were delayed on Tuesday, stranding nearly 10,000 passengers.
The typhoon, the 15th this year, has brought heavy rains to Guangdong.
In Yangjiang City, where the typhoon downgraded into a strong tropical storm, fallen trees and branches could be seen along the roads.
In Sanya City in the southern island province of Hainan, the typhoon brought rain of more than 167 millimeters.
Shipping services across the southern Qiongzhou Strait, which have been suspended since Monday afternoon, were expected to resume Wednesday.
Local experts have warned of flash flooding, with the possible dangers of mudslides and landslides.
Koppu would bring heavy rain to most parts of southwestern Guangxi Zhuang Autonomous Region, Hainan and Guangdong during the next two days, China's central observatory said.