Sydney asks thousands to evacuate as heavy rain causes flash floods

Torrential rain pummelled Australia's east coast on Thursday with Sydney receiving nearly a month's rain overnight, turning suburban roads into rivers and triggering evacuations as authorities warn of more rain through the day.

A man swept away by floodwaters in the city's northwest was rescued by emergency crews, media reported, while television footage showed vehicles struggling to cross waterlogged streets, fallen power lines and trees, and debris floating in rivers.

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Residents of a nursing home were evacuated overnight as emergency crews urged the harbour city's 5 million residents to avoid unnecessary travel and brace for possible evacuations.

"This is a highly dynamic situation. These events are moving exceptionally quickly," New South Wales emergency services Acting Commissioner Daniel Austin said during a media briefing. "Exceptionally sharp, short bursts of rain" have been creating flash flooding almost every hour, he said.

A building is surrounded by floodwaters in Londonderry on the outskirts of Sydney, Australia. File/AP

Sydney has received 1,227 mm (48 inches) of rain so far this year, more than its average annual rainfall of 1,213 mm. Over the next 24 hours, many coastal towns could get up to 180 mm (7 inches), the Bureau of Meteorology said.

The tourist hot spot of Bondi recorded around 170mm over the 24-hour period to 9am on Thursday (2300 GMT, Wednesday), official data showed.

Thousands have been ordered to evacuate their homes while businesses cleared essentials to help mitigate their losses.

"All hands are on deck to try and save some furniture ... so we have been pretty busy lifting things up... moving things away, unplugging filters and electricity, and things like that," Nicola Gilfillan, a cafe owner in southwest Sydney, told ABC television.

Overflow from a fuel pit at a site owned by oil refiner Ampol in Sydney's south caused oil to mix with flood waters but emergency crews said the spill has been contained and that there was no risk of danger in the area.

A severe weather warning stretched along the south coast of New South Wales over a distance of more than 600km (373 miles) but conditions are expected to ease from Thursday evening, the weather bureau said.

Reuters