An 18-year-old man has been charged with murder after the body of a 19-year-old woman, his former partner, was found in bushland in southeast Queensland.

The pair, who police say had been in a relationship that recently ended, met on Saturday afternoon at a car park in Strathpine.

The woman from Petrie did not return home, leading to her family raising concerns.

Police tracked down the Kallangur man on Saturday evening at a service station in Nambour, about an hour's drive north of Strathpine.

The woman's body was found around 3am on Sunday in bushland at Nambour, and the man has since been charged with murder and moving a corpse.

"(They had been in an) intimate relationship that recently ended. The family of the young lady have been advised ... they are devastated," Queensland Police detective inspector Ben Fadian told reporters.

He said investigations were ongoing into the cause of death and circumstances surrounding their meeting.

"There were no domestic violence orders in place. And there was no history of either party being in contact with police about anything of that nature," he said.

Det Insp Fadian said there was no evidence of anyone else being involved in the alleged murder.

"This is a tragic event, the young lady ... had her whole life ahead of her," he said.

The man is expected to face Maroochydore Magistrates Court on Monday.

Police are examining a white Ford Mustang and blue Mazda sedan as part of their investigations and have asked anyone with information to come forward.

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With up to 150mm of rain expected on the NSW north coast, thousands of residents are again bracing for floods.

The latest evacuation orders have been issued for Moree as a new major flood peak looms on the Mehi River, a tributary of the Gwydir River, threatening to surpass a 10.87m high mark recorded 67 years ago.

In all, there are 120 flood warnings current around NSW, 20 of them at emergency level.

The state's SES says it conducted 31 rescues and responded to almost 400 requests for help in the 24 hours to 9am on Sunday.

A man in his 30s died in a suspected drowning on Saturday at West Ballina, on the far north coast, while two men stranded in vehicles in the Southern Tablelands centre of Yass were rescued overnight.

Authorities say renewed thunderstorms have impacted multiple flood-affected communities along swollen rivers.

Most are in areas surrounding Moree, Gunnedah and the neighbouring village of Carroll on the northern Namoi River, the Riverina town of Narrandera on the Murrumbidgee and Moama on the Murray River.

"We are seeing more rainfall come through this morning, which will lead to more water movement and fill rivers and flooding," the SES said.

Incident controller Tom Jory said in a statement on Saturday the current predictions, while not as severe as earlier this year, meant low lying areas were still likely to be impacted.

The Bureau of Meteorology expects heavy rain over the state's northeast from Sunday morning, affecting Lismore, Grafton, Casino, Kyogle, Yamba and Maclean.

Falls of up to 150mm in six hours were possible in some areas.

Emergency Services Minister Steph Cooke says large parts of the state, including the inland and west, are in for a "difficult few days".

Emergency services and volunteers are currently handing out 30,000 sandbags a day.

"We are quite literally sandbagging the state," Ms Cooke said on Saturday.

Two hundred Australian Defence Force personnel have been deployed in Dubbo, Moree and the Northern Rivers, with two additional ADF helicopters ready for night rescues.

Specialist swift-water rescue crews have also been dispatched to the flood-threatened north while others are in place on the Macquarie River, at Dubbo.

The 12 local government areas added to the state's natural disaster declaration list are Albury, Berrigan, Carrathool, Cobar, Federation, Griffith, Hay, Leeton, Murray River, Murrumbidgee, Narrandera and Wagga Wagga.

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Parents hoping to qualify for the Commonwealth's extended parental pay scheme will be able to be assessed on their combined income.

The Albanese government has released details about its "family-friendly" budget, which includes its plan to extend the paid parental leave scheme from 20 to 26 weeks.

Parents hoping to access Commonwealth paid parental leave have previously been assessed on their individual incomes.

Starting from July next year, parents will be assessed on a dual income basis, with $350,000 the combined cut off.

At the last election, the previous Coalition government also promised to change the income thresholds.

Shadow treasurer Angus Taylor said the income threshold changes would boost workforce participation of women who are the primary breadwinners.

"That's extremely good news," he told ABC News.

Under the Albanese government's new scheme, parents will be able to take their leave at the same time and the rules will be tweaked to make it easier for parents whose partners' don't meet residency requirements to access the scheme.

The changes are expected to benefit more than 180,000 families nationally.

The government will also invest $12.4 million into playgroups and toy libraries as part of its budget support for families.

Labor has also promised to boost Commonwealth childcare subsidies for most families.

"So central to a family friendly budget, is the biggest new investment, which is childcare, but also making sure that we get paid parental leave right so that families can better manage their work and family responsibilities," Treasurer Jim Chalmers told Sky News on Sunday.

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A 18-year-old Queensland woman's body has been found in bushland, with police charging a 19-year-old man with her murder.

The pair, who are known to each other, met on Saturday afternoon at a car park in Strathpine, north of Brisbane, police say.

The woman from Petrie did not return home, leading to her family raising concerns.

Police tracked down the Kallangur man on Saturday evening at a service station Nambour, about an hour's drive north of Strathpine.

The woman's body was found overnight in bushland at Nambour, and the man has since been charged with murder and moving a corpse.

He is expected to face Maroochydore Magistrates Court on Monday.

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