UPDATE: The third and final front is expected to hit Perth tonight.
The Bureau of Meteorology said the storm front was likely to be one of the biggest of the year for Perth.
Damage to homes and properties was likely to occur throughout the night.
Read below for advice to prepare for the storm.
THE Bureau of Meteorology has issued a severe weather warning, with a strong cold front approaching the south west of the state.
The front is expected to hit Perth about 1am on Saturday morning, bringing with it damaging winds in excess of 100km per hour.
Damaging winds may develop from 6.00pm tonight about the Southwest Capes then extend to an area southwest of a line from Mandurah to Windy Harbour about 11:00pm.
Conditions are expected to ease from the west Saturday morning as the cold front moves inland.
Another front is expected to reach the south-west corner of the State Saturday evening and may produce another period of gusty winds and heavy rainfall.
A third, much stronger cold front – the strongest for the year – is expected to affect the southwest corner of the State from Sunday night.
Locations which may be affected include Bunbury, Busselton, Mandurah, Margaret River and the Perth metropolitan area.
This is typical weather for this time of the year but winds may cause damage to property and make road conditions hazardous.
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.