Floodwaters in New South Wales are expected to peak today, with thousands evacuated in one northern town.
Residents across Victoria, NSW and Queensland have been preparing for floodwaters to rise as already saturated catchments are inundated by the deluge.
Flood-weary residents in Lismore, in the NSW Northern Rivers, are breathing a sigh of relief as the Wilson River peaks well below levels seen in the devastating February disaster.
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Residents can stay across all NSW flood warnings here, Victoria here and Queensland here.
The river is currently sitting at six metres and is expected to peak at 7.8 metres around 8pm.
In the February floods, the river peaked at more than 14 metres.
Locals are relieved that the floodwaters are well below the previous emergency as the community is only just recovering.
"Everyone was nervous. Everyone was really scared and upset, when you hear the rain and you see predictions that huge, 300mm would have smashed us," Lismore resident Paul Cregan said.
A moderate flood warning remains in place and is expected to impact parts of north and south Lismore.
Around NSW, 43 local government areas are declared natural disaster zones.
At Moree in the state's north, waters have spread across more than 100km of floodplains.
"We have a major flood emergency in full swing right across our state," Premier Dominic Perrottet said.
"We do expect rising floodwaters.
"In addition to that, we also expect flash flooding across New South Wales with further storms on the way."
Perrottet pledged support would be in place to aid communities wrecked by flooding.
NSW State Emergency Service and Australian Defence Force crews were doorknocking until 1am this morning to warn residents to leave and said they are pleased with how locals have responded to warnings.
"It is a show of the town of Lismore and the people's resilience to what is in front of them," NSW SES Simon Merrick said.
"They have taken the warnings well and it is pleasing to see that people are not driving into floodwater."
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Meanwhile, floodwaters have swallowed Moree, in the state's north, while residents in Byron Bay remain under a "Watch and Act" weather alert after the CBD was hit with flash flooding.
"Around 4000 people have been told to evacuate at some point over the past few days," Emergency Services Minister Steph Cooke said.
"Unfortunately hundreds of properties have been impacted by these floodwaters."
Several major roads remain closed around regional NSW due to flooding. Residents can stay across updates here.
Emergency Services Minister Steph Cooke said there's "literally a flood risk in every corner of the state."
"What we are currently experiencing is more flood threats in more communities and locations than at any other time this year," she said.
More than a dozen flood warnings for Queensland
The bureau has a hazardous surf warning in place from Ballina all the way into the south east Queensland corner.
On the Gold Coast yesterday, beaches were closed as waves around two to three metres pounded the coast.
There are more than a dozen flood warnings in effect across Queensland with a major warning current for the Macintyre River, which has inundated the town of Goondiwindi.
A major peak up to 10.2 metres is expected early Monday afternoon.
Queensland authorities said there had been 167 requests for help, including a water rescue, so far this weekend.
Volatile weather system bears down on Australia's east coast
The "intense" system will travel southwards over the course of the week before finally reaching Tasmania on Friday, Weatherzone said.
"Rainfall totals around the northern parts of New South Wales over the next few days could reach between 140-200mm," Weatherzone said, explaining what the next few days will hold.
"As the system reaches the southeast coast of NSW rainfalls will continue to be significant with a possibility of accumulated falls of 40mm to 160 mm over a 3-day period, with the heaviest falls likely to be along the coast.
"Victoria will not escape the heavy falls with potential rainfall totals between 50mm and 150 mm later in the week.
"Continuing down to Tasmania we will also see some significant rain where totals may reach between 40mm and 150 mm."
The weather service said a high pressure system will form over NSW "bringing some respite" over the weekend, however that will be short-lived.
Another low pressure system will move across southeast Australia early next week.
