A “bombing low” that brought destructive winds, heavy rain and eight-metre waves to Western Australia is moving east, sparking further warnings.

The Bureau of Meteorology said an unusually deep low-pressure system was behind the storms that brought high tides and massive waves at the weekend, as well as flooding in Perth’s CBD that stranded cars and submerged walkways.

Tens of thousands of people had no power across southern Western Australia on Monday morning. Roofs had also been ripped from buildings as the extreme weather, typically seen only once every five years, brought wind gusts of up to 135km/h to Perth and communities along the WA coast.

“There are about 1300 incidents we’ve got on the network at the moment, so it’s definitely not a small event,” Western Power’s head of operational maintenance Brett Hovingh told the ABC.

There were coastal hazard warnings for Albany, Bunbury, Esperance Geraldton, Margaret River and Perth. Other towns had downpours as the system moved through, with Ludlow, about 200 kilometres south of Perth, copping 43 millimetres in two hours on Saturday night.

A severe weather warning remained for damaging winds in central and south-east WA on Monday.

Forecaster Weatherzone said the “bombing low” should move off WA on Monday.

“As the low-pressure system moves further east, wet and windy weather will spread over southern and south-eastern Australia during the next few days, impacting parts of South Australia, Victoria, Tasmania, NSW and the ACT,” it said.

Weatherzone said damaging wind gusts were likely in some parts of SA and Victoria on Monday, possibly including Adelaide and areas near Melbourne. They are likely to spread into parts of NSW from Tuesday, most likely about the southern and central ranges.

“The large and slow-moving nature of the low pressure system will cause several days of rain across southern and south-eastern Australia between Monday and Thursday. The heaviest falls from this system will occur in areas exposed to westerly component winds,” it said.

“Accumulated rainfall totals of 50-100 millimetres are possible in southern, central and north-east Vic and southern NSW between Monday and Thursday. More widespread totals of 20-50 millimetres are possible in SA, Tasmania, Victoria, NSW and the ACT over this four-day period.”

The Bureau of Meteorology also issued warning for abnormally high tides for the South Australian coast and much of the Victorian coastline on Monday.

“Abnormally high tides which may lead to sea water flooding of low-lying coastal areas are possible between Head of the Bight and the SA/Victorian border, including Kangaroo Island,” it said.

“Tides are likely to rise well above the normal high tide mark during the Tuesday afternoon high tide.”

The warning for Victoria covers the coastline from the SA border as far east as Geelong.

There are also damaging wind warnings for SA, Victoria and parts of NSW.

“Strong winds averaging 50-60km/h with damaging wind gusts of around 90km/h are possible from early Tuesday morning over southern ranges before extending to the Blue Mountains later in the morning. Winds are forecast to ease in the south during early Tuesday afternoon, and over the Blue Mountains by sunset,” the weather bureau said.

“Blizzard conditions are forecast over alpine areas above 1900 metres from Tuesday morning.

“The NSW National Parks and Wildlife Service recommends that back country travel be postponed until conditions improve.”

-with AAP