Some of the year's worst weather set to hit WA next week

More wild and potentially dangerous weather, the likes of which the Bureau of Meteorology warned was only seen once or twice a year, is set to hit Western Australia less than a week into winter.

A low-pressure system may bring thunderstorms, damaging winds and heavy rainfall to the west of the state with between 25 millimetres and 50mm expected along the coast and through the Gascoyne.

Powerful northerly winds blowing more than 90 kilometres per hour are due to arrive on Monday ahead of the system affecting an area between Onslow down to Albany, including Perth.

"During Tuesday those strong northerly winds will push right through the southern half of the state, so pretty much everywhere will experience these strong windy conditions, but the rainfall will be heaviest in the west," senior forecaster James Ashley said.

Photo The Bureau of Meteorology is forecasting Tuesday will be the worst day for storms set to hit WA's South West.

A map of Australia showing a big rainfall patch over South West WA. Supplied: Bureau of Meteorology

"It's not dissimilar to the system that moved through late last week with really strong northerly winds developing late on Monday."

A 'perfect storm' for bushfires

Photo A slide melted in the heat of bushfires at Peaceful Bay, near Albany in WA's south.

A partially melted blue plastic playground slide and twisted corrugated metal after a bushfire. ABC News: Meggie Morris

The cold front which hit the southern half of the state last week delivered warm dry winds in excess of 100kph, which fanned several fires in the Great Southern region around Albany into raging infernos.

It created what authorities described as a "perfect storm" for bushfires following a recent dry spell in the area.

Blazes within 10km of Albany burnt through more than 20,000 hectares of land, destroyed a family home and killed hundreds of head of livestock.

Photo Burn-offs escaped containment lines in the region, forcing people to evacuate their homes.

A wall of flame on a hill with lights in the foreground. Facebook: ABC Great Southern

A Department of Parks and Wildlife (DPAW) prescribed burn in the Stirling Ranges which escaped containment lines was behind the largest of the two fires and it is believed private burn-offs led to the others.

The Department and private landowners were heavily criticised for carrying out burn-offs in the lead up to the storm and the State Government has indicated there will be a thorough investigation into the fires.

A DPAW spokeswoman said it had no prescribed burns scheduled for next week when the approaching system is due to hit.

City of Albany Mayor Dennis Wellington said a total fire ban had been put in place, which would run until at least mid-June, as the community continues with clean-up and recovery efforts.

Photo People took to social media to share the hail which fell in Baldivis.

A handful of hail which fell in Baldivis. Facebook: Chiara Demarte

A Department of Fire and Emergency Services spokeswoman said it would closely monitor the approaching system to see if fire bans need to be implemented elsewhere.

The low pressure system last week caused widespread damage throughout much of the state, including the Perth metro area.

One elderly couple suffered spinal injuries when a eucalyptus tree fell onto their moving car in Churchlands.

Another thunderstorm, which tore through the city yesterday, brought hail and winds over 100kph and briefly left 25,000 properties in Perth's south-east without power.

Photo Storms in late May caused significant erosion at Port Beach in Fremantle.

Eroded bitumen, concrete and fence with warning tape at Port Beach, Fremantle. ABC News: Nicolas Perpitch

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