Huge downpours have caused widespread flash flooding in Queensland and NSW, cutting off roads and putting hundreds of thousands of livestock at peril.
A whopping 210mm of rain drenched Currarong, a coastal fishing and tourist village south of Wollongong, in the 24 hours to 9am on Sunday.
The rainfall is expected to ease on Sunday but authorities are warning of long-term isolation for residents in western NSW.
"Communities along the Paroo and Warrego Rivers ... you could actually face up to six weeks of isolation," NSW State Emergency Service deputy commissioner Deb Platz told reporters on Sunday.
"Once this system passes, another system is expected to come into NSW on Wednesday," Ms Platz said, adding it will bring significant rain to the northeast and northern Mid North Coast.
Authorities are still searching for an elderly man who was swept away in floodwaters that isolated campers on the Mid North Coast.
The man was attempting to drive across a flooded causeway at Bretti, about 100km west of Taree, late on Saturday night after the Barnard River broke its banks.
His SUV, which was towing a caravan, was swept into the floodwaters and neither the driver or car have been found.
The missing man had been trying to leave a campground where about 22 people were stranded, Ms Platz said.
Some areas in outback Queensland received their annual average rainfall within several days, the Bureau of Meteorology said.
Dozens of outback Queenslanders were flown to safety on Saturday as floodwaters took over their towns and properties.
Grazier Anthony Glasson, whose merino wool station with 2000 cattle and 8000 sheep is 35km south of Thargomindah in southwest Queensland, is surrounded by swelling rivers from all directions.
"We've had a lot of flooding events here. It's not an uncommon thing, but of this magnitude, this is unprecedented," he told AAP.
"The days are blurring together a bit now ... the scale and the area (of flooding) that's covered is just quite phenomenal."
Mr Glasson has been stuck in mud ushering his cattle to higher ground and trying to cart some hay to feed them for the next few weeks.
"On our property, there was too much water but we could get them (cattle) through the fence onto the neighbour's property and onto a high spot ... and they'll be stuck on that island for two or three weeks," Mr Glasson said.
The Bulloo River, close to Mr Glasson's property, has risen to more than 6.4 metres high from being a dry river bed in recent days.
"If we have more significant rain on Tuesday and Wednesday, it's going to make what's already a bit of a scary situation even worse."
With roads in the east of his station cut off, his biggest concern is delivering enough hay aerially to his livestock so they don't go hungry.
A number of communities "are yet to see the worst of the flooding event", Queensland Premier David Crisafulli warned.
He noted the agricultural impacts were already significant.
The premier flagged several major flooded rivers including Cooper Creek, which runs through Queensland and South Australia and is estimated to be well above the major flood level of 1974 and still rising.
Over 140 state controlled roads remain "out of action," he said.
A major concern was getting enough aviation fuel to choppers to drop fodder for livestock.
"We saw in 2019 major (livestock) losses into the hundreds of thousands and we're doing all we can to minimise that, and fodder remains a really key part of that," Mr Crisafulli said.
In Western Australia, communities are also not out of the woods as ex-tropical cyclone Dianne moves inland after crossing the coast on Saturday morning.
Dianne has dumped 150mm of rain on the small Kimberley town of Derby and another 60mm has fallen over southern parts of the region.
Heavy rainfall is expected further inland on Sunday as the quick-moving weather system tracks toward the Northern Territory border.
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