Melbourne is facing more severe thunderstorms as people in the city's outer east begin the clean-up from wild weather.
Storms with wind gusts to 100km/h have brought down trees and damaged homes in the Whitehorse, Knox and Maroondah regions and cut power to thousands of homes.
The wild weather crossed the city from Wednesday afternoon to early Thursday.
Bureau of Meteorology senior forecaster Dean Stewart said severe storms with heavy rain, damaging winds and hail could return on Thursday afternoon. The temperature is forecast to hit 33C.
"We have very humid conditions and a trough coming in from the west. The atmosphere is very unstable," Mr Stewart told AAP.
"It's more unstable than yesterday in the upper atmosphere. That's why there is the risk of large hail but damaging wind and heavy rainfall is more likely."
There is a 95 per cent chance of showers in Melbourne on Thursday, most likely in the afternoon or evening with local thunderstorms that might become severe.
The State Emergency Service took more than 1000 calls for assistance in two hours when storms hit about 2.30pm Wednesday afternoon, spokesman Stefan Delatovic said.
Of those, 765 calls came from Whitehorse, Knox and Maroondah and another 135 from around Hastings on the Mornington Peninsula.
Most calls were for fallen trees, with some for minor to moderate building damage, while occupants were forced to leave two houses that suffered significant damage at Ringwood and Vermont.
Mr Delatovic urged Melbourne residents to tie down or secure loose objects around their homes and clear gutters ahead of Thursday's predicted storms.
