HONG KONG (REUTERS) - The chance of finding 27 crew members alive from a vessel that snapped in two as tropical storm Chaba passed through Hong Kong and southern China is "very slim", government rescue authorities said on Sunday (July 3), as the search for those missing continued.

On Saturday, the authorities rescued three of 30 crew members as strong winds and rain battered the coast and waters about 300km south-west of the city, Hong Kong Government Flying Service said.

The site of the incident was surrounded by about 100 wind turbines that, compounded with gusts reaching up to 140kmh, had hampered rescue efforts.

The search area had been widened but the chance of finding survivors was "very slim", Me West Wu, controller of the Government Flying Service of Hong Kong, said on Sunday.

Hong Kong sent nine aircraft to jointly conduct search and rescue operations with forces from the mainland.

Some of the crew had likely abandoned the vessel as it snapped in two, the surviving crew members told the authorities.

Chaba skirted the global financial hub, bringing heavy rain and winds on Friday and Saturday, restricting public transport and forcing many businesses to close.

The authorities in Hong Kong raised the typhoon warning on Thursday just as Chinese President Xi Jinping arrived in the city to commemorate the 25th anniversary of its handover from Britain to China.