Lingering rains from Haikui batter China for 7th day - RTHK
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Lingering rains from Haikui batter China for 7th day

2023-09-11 HKT 15:37
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  • People wade through flood waters at the Shenzhen Bus Station. File photo: AFP
    People wade through flood waters at the Shenzhen Bus Station. File photo: AFP
Residual rains from former typhoon Haikui, now a tropical storm, drenched southern China for the seventh day as slow-moving storm clouds drifted from Guangdong on the coast to Guangxi, flooding low-lying areas, blocking roads and trapping residents.

In the rural county of Bobai in Guangxi region, rescuers on boats have scrambled to pull people to safety since Sunday night as water more than 2 metres deep stranded residents in low-rise homes, state media reported on Monday.

In hillier areas, landslides destroyed roads and bridges collapsed. At one weather station in Bobai, local records were shattered when rainfall reached 511.2 mm, more than a quarter of the region's annual precipitation.

Haikui has weakened from a typhoon to a tropical storm since making landfall in Fujian province on September 5, but its residual vortex has continued to wreak havoc in southern China, with the populous city of Shenzhen deluged by the heaviest rain since records began in 1952.

Scientists warn that typhoons hitting the nation are becoming more intense and their paths growing more complex, escalating risk of disaster, even in coastal cities such as Shenzhen that regularly brave tropical cyclones and already have strong flood defence capabilities.

"Typhoons that move far inland affect regions historically less exposed to heavy rainfall and strong wind, often with lower disaster resilience, leading to more severe losses," said Shao Sun, a climatologist at the University of California, Irvine.

"In this case of Shenzhen, the disaster was mainly due to the slow westward movement of Haikui's residual circulation, which nearly stagnated in its spatial position from the afternoon of September 7 to the early hours of September 8, and a 'train effect' of heavy rainfall occurred, causing the event to exceed its expected intensity."

A so-called "train effect" refers to the cumulative effect of multiple convective cloud systems passing over an area in succession, resulting in a significant accumulation of rainfall accumulation and sharply raising the potential for heavy or even extreme rainfall.

Heavy rain is expected to persist in Guangxi over the next few days. (Reuters)