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Victorian and New South Wales residents have been warned to prepare for "life threatening" flash flooding with severe rainfall expected to smash the states today.
The Bureau of Meteorology has said the extreme weather event will sweep across northern Victoria and southern New South Wales from this afternoon, and has warned flash flooding and thunderstorms are highly likely.
It comes after severe flooding hit parts of Victoria last week, inundating towns and causing multiple deaths.
A severe weather warning has been issued, with the BOM warning showers and thunderstorms would increase across the day and said those in campgrounds and caravan parks were most at risk.
It's expected heavy rainfall will develop later on Sunday night, which could lead to "dangerous and life-threatening flash flooding" in the northern parts of Victoria and East Gippsland, and in southwest New South Wales, including Wagga Wagga and Deniliquin.
The intense rainfall is expected to continue into Monday morning.
About 150 millimetres of rain has been forecast, but authorities expect severe storms could dump more than 200 millimetres, causing flooding with catchments already filled by last week's downpours.
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"We are planning here … for what is possible, we are planning for in excess of 200mm of rain," Emergency Management Commissioner Rick Nugent said on Saturday.
"The extreme weather event will commence in the north-west and the south-west before moving across through central, north-central and into the east of the state."
Residents have been urged to prepare, particularly those living in flood-prone areas.
It comes after two people died a dozens had to be rescued from a campground in eastern Victoria last week.
"It's highly likely that there will be flash floods in flood-prone areas," Nugent said.
"If you're living in a flood-prone area, please make the necessary plans."
He added a plea for drivers to avoid floodwaters: "You're driving a car, not a boat."
A spokesman from the Bureau of the Meteorology said: "We're going to see widespread rain and thunderstorm activity developing over western parts of the state throughout the Sunday morning and then through the rest of the day."
A severe thunderstorm warning has also been issued for South Australia, with heavy rainfall forecast for parts of the state.
The warning has been sent to residents on the York Peninsula and Kangaroo Island districts, with residents urged to prepare for potential flash flooding.
Severe thunderstorms are likely to produce heavy rainfall over the next several hours, with the Kingscote and Warooka areas expected to be hit.