Queensland residents are bracing for more wet weather and flash flooding with the state's south-east once again in the firing line for an extreme weather event.
A major flood warning remains in place in the community of Dalby, west of Brisbane, as floodwaters spill from Myall Creek and the Condamine River.
The catchment was inundated overnight, triggering major flash flooding through the town.
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The Bureau of Meteorology confirmed flooding is expected to peak at 3.65 metres, almost reaching 2011 flood heights at around midnight tonight with more rain and thunderstorms expected this afternoon.
Bureau of Meteorology emergency management meteorologist David Grant said while the rain event was unlikely to match the flooding seen last month, already wet catchments meant flooding was still likely across the south-east.
"Given the wet catchments, we're going to potentially see very rapid rises in a lot of our creek systems across south-east Queensland in the next 24 hours," he said.
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QFES State Commander of Operations Cheryl-Lee Fitzgerald said emergency services had conducted nine rescues overnight and today with 80 calls for help.
One man has died in the floods after being discovered in his submerged ute and another remains missing, bringing the state's six-week flooding death toll to 14.
"This is a reminder of how quickly, and dangerous these situations can get," Ms Fitzgerald said.
"We can not understate how dangerous this flash flooding can be.
"Expect it's going to be wet for much of the south-east region."
She added residents in the south-east should never drive through floodwaters and to avoid driving where possible.
"We do ask the community please stay up to date with Bureau warnings over the next 24 hours," Ms Fitzgerald said.
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In Dalby, 11 schools have been closed due to the flood risk.
Residents have been urged to prepare should an evacuation be necessary.
Dalby local Charlene Hall has secured furniture from low-lying levels of her home to the ceiling in preparation for more floods.
"Everyone knows we live on a flood plain," Ms Hall said.
"We've seen a bit of water come in through the town in the last few months, it's probably helped people be more prepared."
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Norm Townsend said after three floods in four months, fellow Dalby locals were now used to flooding.
"At home there I had 150mm I measured in my rain gauge," he said.
"I was half-prepared because we only flooded what, three or four weeks ago?
"This is the third time in four months I've flooded.
"Every time it gets higher, higher, higher."
Areas in the Condamine River catchment recorded 50mm-120 mm in the 24 hours to 9am today with Myall Creek receiving the most rain with 160mm.
Flood warnings have also been issued along the Bokhara River, the Condamine River towards Warwick, the Balonne River and Charleys Creek.
Queensland, NSW east coast in firing line for heavy rain and storms
A severe storm warning is in place for a 500-kilometre stretch of coastline across New South Wales and Queensland, as a rain bomb unleashes.
A month after the catastrophic flooding event of February, March, the Bureau of Meteorology has said communities across north eastern NSW and south east Queensland are at risk of "dangerous and life-threatening flash flooding".
Thunderstorms are also expected in Brisbane and the Gold Coast today.
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Across the border in NSW, a minor to major flood warning is in place for the Culgoa, Birrie, Bokhara, and Narran Rivers.
Hazardous surf warnings have been issued for south of Cape Moreton, including the Gold Coast and in NSW's Byron Coast, Macquarie Coast and Hunter Coast.
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Main Beach on Stradbroke Island is closed today due to dangerous surf.
The warnings came after the BoM put a stretch of coastline from Noosa, down to Coffs Harbor in NSW on alert.
Today, the bureau warned Queensland could see "locally intense rainfall leading to dangerous and life-threatening flash flooding possible with thunderstorms with six-hourly rainfall totals in excess of 200mm."
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A severe weather warning has also been issued for people in Northern Rivers and parts of Mid North Coast and Northern Tablelands Forecast Districts, with up to 180mm of rain forecast.
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The NSW SES is urging residents to take care, explaining the ground and catchments are sodden which heightens the risk of flash and riverine flooding.
"Our catchments are very wet, and our dams are full, so it will not take a lot for floods to occur," NSW SES Assistant Commissioner Nicole Hogan said.
"People need to monitor the weather conditions closely and be prepared to act early.
"In the event flooding does occur, there is a very real chance that roads can be impacted.
"If you are on the road and come across floodwater, do not attempt to drive, walk or ride through it. Instead, turn around and find another way."
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What is causing the rain?
BoM meteorologist Jackson Browne said falls of up to 200mm have already been felt across the Northern Rivers in NSW after a wet weekend.
He explained the wet weather is being caused by a coastal trough, which is expected to deepen over south-east Queensland today.
"A band of cloud and extensive moisture wraps around an upper level low," he said.
"That is creating severe storms.
"This upper level low will cause a rapid deepening of the coastal trough."
Rain activity is forecast to shift over the Northern Rivers "and possibly down to the Hunter region" tomorrow.
The BoM said the low pressure system is fast-moving, unlike the one that lingered for days at the end of February, responsible for the deadly flooding event across the two states.
"It does draw away on Wednesday," Mr Browne said.
"We should see a cessation mostly of the rainfall occurring through Queensland however the onshore flow will still create some showers and storms possibly for parts of NSW."