Remnants of an ex-cyclone are set to bring more wet weather to a sodden state, triggering fears flooding could worsen.
Floodwaters twice the size of Victoria have inundated western Queensland after record rainfall, forcing many - including an entire town - to evacuate.
Flooding in the region is considered the worst in more than 50 years and could last weeks, sparking fears of mass livestock losses.
However, locals have been warned that water levels could rise again with the remnants of ex-tropical cyclone Dianne bringing more rain.
"With more rainfall to come, this will fall particularly across flood-affected parts of outback Queensland which are already being heavily impacted by this flooding," the Bureau of Meteorology's Jonathan How said.
"Additional rainfall could cause more renewed creek and river level rises and in some parts, may prolong some of those flooding impacts."
Remote communities near the Northern Territory's Alice Springs and Uluru were expected to be impacted by ex-cyclone Dianne's remnants after the system crossed Western Australia's northwest coast days ago.
The wet weather was then set to push into central Queensland and down to northern New South Wales by Tuesday, with rain not expected to ease for days.
The heaviest falls are set to hit southern Queensland and northern NSW on Wednesday, with totals exceeding 100mm in some areas.
More rain will ensure further hardship for graziers, sparking fears for some that they will lose 100 percent of their stock.
The full extent of the damage won't be known until the flooding eases, a process that could take weeks.
"We're talking about a massive loss ... in relation to their livestock, cattle, sheep and goats," Queensland Emergency Services Minister Dan Purdie said.
"Some of those families and some of those farmers have been on the land for a long time - it might take a long time to recover."
Helicopter pilots have gathered to help evacuation efforts in the southwest, with Adavale's entire population of about 30 people rescued in recent days.
They have also helped drop off food supplies and livestock fodder, with roads cut or badly damaged by floodwaters.
"A lot of the creeks are still up and what roads are open, they're pretty gouged out," said Anne-Maree Lloyd, who had to evacuate her Jedburgh homestead near the Barcoo River.
"Semi-trailers with a full load of hay just wouldn't get along them.
"The logistics of getting that supply into where it's needed is a big issue at the moment. There's just so much water around."
