WA's south is being urged to brace for damaging wind gusts up to 125km/h tonight.
The Bureau of Meteorology issued a severe weather warning this afternoon for people south-west of a line from Mandurah to Albany.
The warning includes Bridgetown, Busselton, Bunbury, Margaret River and Mandurah.
The Bureau says a deep low will pass through the areas and could cause significant damage to homes and property.
The strong wind gusts are expected to develop near the south-west Capes from 8pm and extend to Mandurah and Walpole at about 11pm.
The Bureau says coastal areas a likely to see the worst of the weather.
Conditions are forecast to ease by tomorrow morning and are "typical for this time of year", according to the Bureau.