Some 50,000 homes in Western Australia are still without power as the state continues to be battered by wild weather for a second day in a row, in a “rare event” described as a “once-in-a-decade” storm.

The state has experienced the wildest autumn weather in years, as the remnants of ex-Tropical Cyclone Mangga collided with a cold front and trough, whipping up gusts of about 100km/h.

While large sections of the state’s coastline were hit over the weekend, the south of the state was set to bear the brunt of the storms on Monday, with strong winds, heavy rain and potential flooding.