The Bureau of Meteorology has issued a severe warning for the South-West region, including Mandurah.
A deep cold pool will move across southern WA on Thursday and during Friday morning, bringing damaging winds, abnormally high tides and damaging surf.
Thunderstorms and showers may produce gusts up to 100 kilometres per hour which could cause damage to homes and properties.
Damaging winds are expected to develop along the west coast around 10pm on Thursday, extending eastwards after midnight.
Tides are likely to rise above the normal high tide mark with very rough seas and potential flooding of low-lying coastal areas.
This is typical winter-time weather over southwest WA, however it is unusual for these weather conditions to occur this late in the year.
The Department of Fire and Emergency Services advises that people should:
* If outside find safe shelter away from trees, power lines, storm water drains and streams.
* Close your curtains and blinds, and stay inside away from windows.
* Unplug electrical appliances and do not use land line telephones if there is lightning.
* If boating, swimming or surfing leave the water.
* Be alert and watch for hazards on the road such as fallen power lines and loose debris.
* Keep away from flooded drains, rivers, streams and waterways.
* Be careful of fallen trees, damaged buildings and debris.
* Be careful of fallen power lines. They are dangerous and should always be treated as live.
* Assess your home, car and property for damage.
* If damage has occurred take photos and contact your insurance company to organise permanent repairs.
* If your home or property has significant damage, like a badly damaged roof or flooding, call the SES on 132 500.
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