Satellite image shows what's to come as Victoria braces for flooding

Millions of Aussies are bracing for another drenching over the next 24 hours with some areas told to expect the worst flooding event in 50 years.

Victoria's State Emergency Services have received more than 600 calls for help overnight and are bracing for hundreds more with flood warnings issued across the state for Thursday.

Most of Victoria has been warned to brace for wild weather and flash flooding today, with the worst set to hit in the afternoon and evening.

There were 12 watch and act orders issued for the state on Thursday morning.

Communities near rivers, creeks and low-lying areas in the Northern Victoria region were asked to stay on alert and up to date with changing warnings.

Residents of Rochester, 180km north of Melbourne, have been sandbagging their homes with fears some 700 houses could be flooded if the nearby Campaspe River bursts its banks.

At a town meeting on Wednesday night, residents were warned waters could potentially rise to 115.5m above sea level, The Herald Sun reported.

If predictions transpire, much of the town of more than 3,000 people will need to be evacuated.

Earlier, rains caused a landslide near Falls Creek. The slow-moving active landslide forced the closure of Bogong High Plains Road at midday on Wednesday, with anyone left in the area told they may not be able to leave for three days.

Only emergency and essential service workers can access Falls Creek or Bogong Village, and the main road won't reopen until the threat has passed.

Satellite image shows what's to come

Satellite images published by Weatherzone show the system behind the pending deluge.

"These enhanced water vapour satellite images show a slow-moving low pressure system over the Great Australian Bight dragging copious tropical moisture across southeastern Australia," meteorologist Ben Domensino said on Wednesday afternoon.

"This weather pattern will fuel flooding rain in Victoria, Tasmania and NSW during the next 36 hours."

Federal emergency minister Murray Watt said the government was on standby to provide any support required.

"We're certainly very concerned about the weather coming through Victoria and Tasmania," he told ABC radio this morning.

With large downpours expected, Victorian premier Daniel Andrews reminded people not to drive into flood waters.

"It's dangerous for you and it's really dangerous for the person who has to come and rescue you," he told reporters on Wednesday.

Wildlife Victoria has initiated emergency response plans and is bracing for an influx of calls for help.

The group doubled the number of emergency response operators on shift on Wednesday night in a bid to cope with the expected surge.

Those in Victoria can keep up to date with flood and weather warnings here.

Severe weather warnings are also in place across Tasmania and NSW, with isolated thunderstorms and damaging winds expected on Thursday along with the potential for moderate or major flooding.

with AAP

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