The extreme weather, typically seen only once every five years, is bringing wind gusts of up to 135km/h to Perth and communities along Western Australia's coast.
The Bureau of Meteorology said the wild weather is caused by an unusually deep low-pressure system.
That weather system, the lowest since May 2020, brought high tides and eight-metre waves while flooding in Perth's CBD stranded cars and submerged walkways.
Wing gusts of 135km/h were recorded at Cape Naturaliste overnight, breaking records, with coastal hazards affecting Albany, Bunbury, Esperance Geraldton, Margaret River and Perth.
A severe weather warning remains for damaging winds in central and southeast WA.
Several WA towns recorded heavy rain as the weather system moved through, with Ludlow, about 200km south of Perth, copping 43mm in two hours on Saturday night.
As the system moves east, it will impact South Australia and Victoria on Monday
Wind gusts of up to 100km/h and flash flooding is predicted for Adelaide, Port Lincoln and the Central and Otway ranges.
"A complex low pressure system will approach Victoria on Monday, with vigorous northwesterly winds expected ahead of a cold front which will cross the state on Monday night," senior bureau meteorologist Sarah Scully said.
Winds are then forecast to ease before dawn on Tuesday morning.
NSW expected to be impacted on Tuesday.
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