Heavy rainfall, flooding expected in Victoria, Tasmania, New South Wales and South Australia

A cold front and low-pressure system is set to bring widespread heavy rainfall from Wednesday evening for Victoria, northern Tasmania, southern New South Wales and far eastern South Australia, the Bureau of Meteorology warned.

While rainfall totals won't be as high as last week's severe weather event, emergency services across the states have warned residents to be watchful of renewed river rises and dangerous flash flooding.

VICTORIA

Victorians are bracing themselves for another bout of severe weather and rainfall, after the Bureau of Meteorology warned of peak rainfall totals of 60-100mm across much of the state.

Parts of northern Victoria were slammed by rain over the weekend, where swollen creeks and rivers caused havoc and flash flooding, prompting the state's SES volunteers to conduct more than 20 rescues where people had entered floodwaters.

Communities in northern Victoria are likely to face the worst of the weather on Wednesday night and into Thursday, and the SES has urged residents to prepare for flash flooding and damaging winds.

Victorian State Emergency Service Chief Operations Officer Tim Wiebusch warned communities to avoid travelling on Thursday if possible.

"Large areas of flash flooding is expected on Thursday and then the possibility of major riverine flooding in multiple catchments. Please do not attempt to drive through flood water," he said.

For Melbourne, the risk of heavy rainfall is likely on Wednesday and Thursday, the Bureau of Meteorology said.

A severe weather warning for heavy rainfall has been issued for people in Mallee, Northern Country and parts of Central, South West, North Central and Wimmera Forecast Districts.

NSW

Southern New South Wales communities can expect 24-hour rainfall totals of 5-15mm on Wednesday, with some areas facing up to 50mm.

Rain and wind will intensify in the state's south on Thursday, bringing up to 60mm of rain to the region, and Sydney residents and those on the east coast can expect rainfall to reach them on Friday, before quickly moving offshore by Friday evening.

Residents in the Riverina region may face six-hourly rainfall totals between 30 and 50mm overnight on Wednesday and into Thursday, the Bureau of Meteorology warned.

NSW residents already faced flooding over the weekend, particularly in the state's central west, and a body believed to be that of a missing man was found in a car submerged in floodwaters in the Campbell River, 45km south of Bathurst on Tuesday, Police said.

In Dubbo, 91mm of rain fell on the weekend, leaving one family's home looking "like a river", they told ACM.

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Tasmania

Residents of Australia's island state should prepare for severe rainfall and flooding on Wednesday evening and into Thursday, the Bureau of Meteorology warned.

"Heavy and consistent rain is likely from tomorrow evening, across Thursday, clearing Friday morning," said Tasmania SES Acting Director, Leon Smith.

"The forecast is for steady and significant rain state-wide, and specifically intense rainfall in the north and northwest."

Mr Smith urged residents to review their household emergency kit and flood emergency plan, including evacuation triggers, and move livestock and animals to higher ground, out of flood prone areas.

In the high ground of Tasmania's north-west and north-east, up to 220mm of rain could fall in the 36-hour period to Friday morning.

Hobart residents can expect up to 30mm, according to the Bureau of Meteorology.

Life-threatening flash flooding is possible over the Great Western Tiers, where 100mm of of rain could fall in the space of 6 hours.

The Bureau of Meteorology issued a severe weather warning for large regions of northern Tasmania and the east coast.

Multiple catchments could face flooding in the northwest, north, northeast and the Derwent River, with major flooding is possible at some locations.