Residents are being urged to prepare now for severe weather coming on Tuesday morning.
A cold front bringing windy conditions, heavy rainfall and thunderstorms is set to hit the coast from Jurien Bay down to Walpole including Perth, Mandurah and Rockingham.
Residents can expect damaging wind gusts of 100km/h and between 40mmm and 60mm of rain.
Conditions are expected to ease on Tuesday afternoon.
Locals are being advised to pack away, secure or tie down outdoor furniture, trampolines and other loose items around the home.
Mandurah woman completes grueling English Channel swim
Man and child seriously injured in South West crash
Motorists warned to expect delays during Kwinana Freeway upgrades
Driver injured in Serpentine crash
Man and woman wanted for questioning over Lakelands car theft
Mission Australia celebrates 25 years of supporting young people through Mandurah Reconnect program
'Mad Eagles fan' wins $6 million Lotto prize
Mandurah woman loses everything in house fire
Gift card scams surge past $1 million prompting urgent warning from Consumer Protection