The biggest storm front of the year is forecast to hit Mandurah and the South West on Sunday night.
The worst of the weather, including severe winds, is expected to hit Mandurah at about midnight and could continue until 5am.
The Bureau of Meteorology is predicting wind gusts of up to 125km/h while up to 25mm of rain is forecast to fall in some areas.
Department of Fire and Emergency Services metro district officer Chris Kin-Maung has told The West Australian, state emergency services and volunteers were on “heightened alert”.
“Even though householders may have been unscathed over the last couple of days, now is the time to prepare.
“If it is safe to do so, take action now.
"Prepare around the home, tidy up loose objects in the garden, secure trampolines, garden furniture and play equipment."
A flood watch has been issued for the South West and Lower West districts.
Locations that may be impacted include include Mandurah, Perth, Albany, Bunbury, Esperance, Katanning, Manjimup, Margaret River, Merredin, Moora, Mount Barker, Narrogin and Northam.
Warning out for severe winds over SW WA, see https://t.co/NikaX4QRKr. Windy conditions persist throughout Monday. #Perthweather #WAweather pic.twitter.com/W5YfOxKn0A
— BOM WA (@BOM_WA) August 13, 2017
Postman injured in Wannanup crash
Man charged after allegedly stealing service medals from Greenfields storage unit
South West resort receptionist charged with 32 fraud offences
Daughter of Port Kennedy hit-and-run victim pleads for offenders to hand themselves in
Concerns for missing woman last seen in Mandurah
Mandurah woman wanted for questioning over current investigation
Investigation underway into Bunbury sexual assault
Two motorcyclists seriously injured in separate crashes
Miraculous escape for two men after plane goes down south of Mandurah