Melbourne is bracing for severe thunderstorms as south west Victoria mops up from flash flooding.
The bureau of meteorology has issued a warning for severe storms in inner Melbourne and the city's north and west, as well as Port Phillip for Friday afternoon.
The storms are likely to see large hail and heavy rail which could lead to floods in places including Ballarat, Daylesford, Geelong, Melbourne, Frankston and Bacchus Marsh.
The State Emergency Service dealt with more than 100 calls for help on Thursday night after severe hail and flash floods hit the town of Portland.
"Over the past 24 hours there have been some wild storms come through various parts of the state," acting premier Jacinta Allan told reporters on Friday.
The bureau says a humid, unstable air mass is lying over Victoria, while a low pressure trough moves slowly east across the state.
The SES warns people should avoid travel if possible, and stay away from trees, drains, floodwater and low lying areas.
People should stay indoors and away from windows, and secure outdoor furniture and equipment.
The storm threat has eased in west and south Gippsland.
