A tropical storm is intensifying and is expected to reach typhoon strength before hitting southern China's coast on Sunday.

Hong Kong saw floods, cancelled flights and at least 30 people seeking medical attention as storm Wipha prompted a typhoon 10 signal on Sunday.

Typhoon Wipha caused severe weather in southern China and Hong Kong, leading to flash floods, landslides, and disrupted transportation. Guangdong and other coastal provinces faced heavy rainfall and wind hazards.

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The Hong Kong Observatory said on Saturday it will raise the Strong Wind Signal No 3 at 2.20pm. Wipha is moving steadily across the northeastern

Tropical storm Wipha is on course to enter within 800 kilometres of Macau tomorrow, with the signal no.1 alert to be issued.