A severe weather warning has been issued for Pinjarra, Harvey and Dwellingup.
Damaging winds averaging 55 to 65km/h with gusts of 90km/h are forecast from late this evening into Thursday morning.
"Gusty easterly winds are relatively common this time of year, however winds are likely to be strong and may cause damage to property and make road conditions hazardous. Easterly winds of this strength generally occur around 1 to 3 times per year," a Bureau of Meteorology spokesperson said.
"Locations which may be affected include Gingin, Harvey, Armadale, Dwellingup, Ellenbrook, Kalamunda, Midland, Mundaring and Pinjarra."
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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