Heavy rain dumped by cold front ahead of stormWednesday May 8, 2013 - 09:17 EST
Residents in Perth and the south-west of the state are are being warned to prepare for more severe weather.
A cold front over the southern half of the state overnight has dumped 42 millimetres of rain in Perth.
Rottnest recorded 61 millimetres and wind gusts of more than 90 kilometres an hour.
Jandakot, Swanbourne and Garden Island have had more than 50 millimetres of rain.
The State Emergency Service has received 37 calls for assistance, mostly in Perth, for water damage and flooding.
Western Power says about 300 homes and businesses in Mullewa, east of Geraldton, lost power during the storm.
Services are expected to be restored by mid morning.
If anyone comes across fallen powerlines, they are urged to contact Western Power.
The Bureau of Meteorology is forecasting severe weather to hit the southern half of the state late tonight.
© ABC 2013
More breaking news
A tropical low off north Queensland has a high chance of developing into a cyclone and making landfall by early next week, the Bureau of Meteorology (BOM) says.
Queensland may see its first tropical cyclone in two years in coming days, although the situation is still hard to call.
It runs one of the most-viewed websites in Australia and broadcasts its weather forecasts and warnings around the country each day.