Thousands of Australians were ordered to evacuate their homes in Sydney on Sunday as torrential rain battered the country's largest city and floodwaters inundated its outskirts.

Roads across the city were cut off and authorities said at least 18 evacuation orders were in place in western Sydney, an area that was inundated with severe flooding in March.

"This is a life-threatening emergency situation," Stephanie Cooke, emergency services minister for the state of New South Wales, told reporters.

Australia has been at the sharp end of climate change, with droughts, deadly bushfires, bleaching events on the Great Barrier Reef and floods becoming more common and intense as global weather patterns change.

With more wild weather expected in the coming days, Cooke described the floods as a "rapidly evolving situation" and warned that people should be "prepared to evacuate at short notice".

The city's Warragamba Dam began to spill in the early hours of Sunday morning, she said, well ahead of authorities' predictions.

While in Camden, a southwestern suburb of Sydney home to more than 100,000 people, local shops and a petrol station were inundated by floodwaters.

Cooke asked those living along a 500-kilometre (310-mile) stretch of Australia's east coast, both north and south of Sydney, to consider cancelling their school holiday travel plans because of the weather.

Emergency services conducted 29 flood rescues and were called out more than 1,400 times in the previous 24 hours, she said.

The east coast flooding event in March -- caused by heavy storms that devastated Sydney's west -- claimed 20 lives.

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Nearly 1 in 4 globally at risk from severe flooding: study
Paris (AFP) June 28, 2022
Almost a quarter of the world's population are exposed to significant flood risks, according to new research published Tuesday, which warned those in poorer countries were more vulnerable. Inundations from heavy rainfall and storm surges affect millions of people every year and cause billions of dollars of damage to homes, infrastructure and economies. And the risks are rising as climate change causes more extreme precipitation and sea level rise, as exposed populations swell. The new stud ... read more