(Bloomberg) -- Typhoon Mulan made landfall in China’s manufacturing hub of Guangdong on Wednesday, forcing some trains and ferries to suspend operations, with the torrential rains heading toward Hainan and potentially disrupting the island’s efforts to contain a Covid outbreak.

Some trains going through Zhanjiang city in Guangdong province will be halted in the next few days, while passenger liner services at ports including Nansha and Shekou in Shenzhen will be partially suspended, transport authorities said in a statement on Wechat. 

Hengqin Port suspended customs clearance service for travelers between Zhuhai and neighboring Macau on Wednesday morning, while the Lianhua Bridge that connects the two cities was closed off, according to a separate statement. Both resumed operations in the afternoon as the storm weakened. 

Typhoon Mulan, China’s seventh powerful storm of the year, was last observed around Xuwen county in Zhanjiang and it’s expected to move at a speed of about 15 kilometers per hour toward the northwest, the National Meteorological Center said Wednesday afternoon. It issued a yellow alert earlier in the day, the third highest in a four-tier colored system. 

The weather center expects torrential rains to hit the southern part of Guangdong, neighboring Guangxi province as well as Hainan. That could put the tropical island in the line of fire as the local government battles a Covid outbreak that has stranded tens of thousands of tourists and could impede mass testing efforts as it works toward achieving zero community spread by Friday. 

China’s southern and eastern coastal cities, which host some of the world’s busiest container ports, are often impacted in the summer by tropical storms that shut operations and delay transport, posing a threat to global supply chains. 

Yantian port in Shenzhen had to halt some container services earlier in the week due to Mulan, before announcing that operations will resume from 8 p.m. Wednesday night. Similar disruptions occurred last August at Yantian and Shanghai’s Yangshan port when typhoon In-Fa slammed into the coast. 

(Updates with Hengqin port resumption in third graph.)

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