A storm has brought down trees, damaged houses and caused some flash flooding at Ballarat in western Victoria.
The State Emergency Service says it has received about 180 calls for help, mostly in the suburbs of Sebastopol and Mount Clear.
The storm is moving south towards Geelong, bringing large hailstones, strong winds and heavy rain.
The SES says damaging winds and heavy rainfall may lead to flash flooding in areas including Murrayville and Rainbow
SES spokesman Lachlan Quick says it is receiving more than three calls a minute.
"Building damage and trees down over roads appear to be the main concerns at this stage," he said.
"It looks as though there's some pretty significant hail associated with this storm and we've got some concerns with road safety given the number of trees down over roads but also there's going to be quite a number of people with damaged roofs."
Earlier, the storm brought down trees near Avoca, causing traffic delays on the Pyrenees Highway at Elmhurst.
© ABC 2012
20:52 EST Power has been restored to nearly all houses and businesses affected when wild weather cut power to about 30,000 properties in Adelaide and Fleurieu Peninsula.