More dangerous weather has been forecast for areas south of Mandurah and east to Norseman this morning.
Yesterday's late storm front dumped more than 60mm in some parts of the metropolitan area and wind gusts of 102km/h were recorded at Mandurah and 96km/h hour at Rottnest.
"If you live between Mandurah to Merredin to Norseman you should take action and stay safe with the start of dangerous weather" the Weather Bureau says. "This type of weather only occurs once or twice a year and could cause major damage to homes and make travel dangerous."
The weather warning includes residents in or near Mandurah, Bunbury, Busselton, Margaret River, Bridgetown, Albany, Katanning and Esperance.
A strong low system is moving across the south of the State is expected to cause widespread damaging winds for much of the day.
"The low is expected to cause widespread damaging winds to 100km/h which could result in damage to homes and property in the area south-west of a line Mandurah to Katanning to Albany from about 8am then extend to remaining parts during the afternoon," the Bureau says. "Higher than normal tides may result in flooding of low-lying coastal areas.
"Dangerous surf conditions are likely which could cause significant beach erosion."
An earlier weather warning for areas between Albany and Hopetoun has been cancelled.
Yesterday afternoon winds of more than 100km/h and heavy rain combined to wreak traffic chaos during peak hour.
The cold front, which hit Mandurah just after 3pm before moving up the coast, brought heavy showers and thunderstorms to parts %of the South West in a line from Denham to Hopetoun.
This morning Weather Bureau duty forecaster Tom Delamotte said there had also been reports of small hail overnight.
“We’re into the really cold air now, it will still be quite squally with thunderstorms,” he said.
Winds of up to 100km/h are expected for the southern parts of the State today and there could be more hail, Mr Delamotte said.
A Fire and Emergency Services Authority spokesman said 31 calls for help had been received from Perth’s southern suburbs yesterday, while six had been received from the South West.
Most callouts related to water damage and flooding, the FESA spokesman said.
This morning there are still 200 homes across the metropolitan area and South West without power after 9000 were plunged into darkness overnight.
Crews worked through the wet and wild weather and had restored power to 7000 homes by 10.30pm, Western Power spokeswoman Heidi Couch said.
In Perth, peak-hour traffic was at a standstill as motorists made their way home as the storm hit.
Gusts of up to 93kmh were recorded at Ocean Reef about 5.30pm and up to 91kmh at Swanbourne half an hour earlier.
Bickley received the most rain with 65mm by 7am.
In Geraldton, shipping delays were expected at the town’s port, which was closed as the weather moved in.
Geraldton Port chief executive Peter Klein said the only ship in the harbour had been sent to deeper waters.
“It’s big enough to be concerned about the safety of vessels alongside the port,” Mr Klein said.
Showers are forecast until Thursday before a fine weekend, when temperatures are expected to be in. the mid-to-low 20s.