Melbourne could be battered with thunderstorms and hail following blizzard conditions in Victoria's eastern alpine areas.
Heavy snow and wind gusts of up to 100 km/h hit Mt Bulla, Falls Creek and Mt Hotham on Sunday, the Bureau of Meteorology said.
Extreme weather conditions also closed part of the Great Alpine Road between Harrietville and Mt Hotham.
Melbourne could be hit with hail and thunder later on Sunday night as storm activity moved east across Victoria, bureau forecaster Dean Stewart said.
"Melbourne has so far has avoided any hail or thunder. However, there's still the chance of it this evening," he said.
Another 10cm to 15cm of snow was forecast for alpine areas on Monday while showers were expected over Melbourne, Mr Stewart said.
In South Australia, a low pressure system on Sunday brought wind gusts and minor flooding to parts of the state.
Gail force winds were recorded on the Yorke Peninsula, while strong winds and rainfall of up to 25mm were recorded over the Mt Lofty Ranges.
A flood warning remained in place for the upper Onkaparinga River but conditions were expected to ease overnight.