A storm has damaged dozens of homes in Perth and left thousands without power.
At the height of the storm, winds in excess of 100 kilometres an hour tore roofs off homes, uprooted trees and left more than 23,000 homes without electricity.
The State Emergency Service received more than 150 calls for help, mostly from Perth's southern suburbs.
Jean Benson says her Palmyra home was damaged by a falling tree.
"I'm in shock," she said.
"The lady next door had to call her son in America so they could ring us to tell us that the tree has gone down into the house."
The Bureau of Meteorology is investigating whether a tornado is responsible for much of the damage.
Main Roads is urging motorists to avoid the old Fremantle traffic bridge which was closed after part of the Swan Hotel roof blew onto it.
Also in Fremantle, the wild weather caused the Fremantle Dockers to cancel a grand final for school students at Fremantle Oval and sea containers on Fremantle wharf were blown on their side.
Police are urging workers in the CBD to leave early to avoid peak hour traffic which is likely to be exacerbated by road closures and traffic light failures.
Flooding has forced the closure of Riverside Drive in both directions and one lane of the city-bound Kwinana Freeway, north of Canning Highway.
The weather bureau says more thunderstorm activity is expected later this afternoon.
It is not likely to be as damaging as this morning's cold front but will still bring showers, thunderstorms and the risk of damaging squalls.
Perth has recorded 28.4 millimetres of rain since last night.
© ABC 2008
12:54 EST Southern New South Wales and the ACT had a chilly start to the weekend, with some places seeing their coldest May night in half a decade.