Communities in NSW's Northern Rivers region are again on flood watch with heavy rain lashing the area.

Forecasters were predicting significant rainfall overnight on Saturday and continuing to Monday, with flash flooding and riverine flooding likely.

The NSW SES says residents, especially those who have been flooded in the past, should prepare.

"While the current predictions are not as severe as earlier this year, low lying areas are still likely to be impacted," incident controller Tom Jory said in a statement on Saturday.

NSW Police said a man in his 30s had died in a suspected drowning on Saturday morning at West Ballina in the state's far north coast.

The Bureau of Meteorology warned of heavy rainfall over northeast NSW from Sunday morning, affecting those in Lismore, Grafton, Casino, Kyogle, Yamba and Maclean.

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

More than 100 flood warnings were current around the state on Saturday night.

In the south, emergency warnings were in place for parts of Narrandera while residents in areas of Gunnedah in the state's north were ordered to evacuate.

Warnings were also in place for Moree and Carroll Village.

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

Emergency services are preparing for a busy weekend as the wild weather arrives, with volunteers handing out 30,000 sandbags a day.

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

Two hundred defence personnel are being deployed in Dubbo, Moree and the Northern Rivers, with two more Australian Defence Force helicopters coming online ready for night rescues.

Specialist swift-water rescue crews have also been dispatched to the flood-threatened north while others are in place 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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A woman has been charged over a car crash that killed two people in NSW's central west.

The 29-year-old faces multiple charges, including two counts of dangerous driving occasioning death, after the crash east of Dubbo last month.

She was granted bail on Saturday and is expected to face Mudgee Local Court in December.

Emergency services were called to reports of a two-car crash at Goolma, 77 kilometres east of Dubbo, on September 16.

A 29-year-old man driving a ute and a 63-year-old woman, a passenger in a four-wheel drive, both died at the scene.

The 29-year-old woman charged on Saturday was driving the 4WD.

Also in the car were a 30-year-old man and three children, aged one, six and nine, all of whom were pulled from the wreckage along with the driver.

They were treated by firefighters and airlifted to Westmead Hospital with serious injuries but have since been released.

Police established a crime scene and after inquiries, arrested the 29-year-old woman at Mudgee Police Station on Saturday.

Her driver's licence has been suspended.

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Boris Johnson has arrived back in Britain as he considers an audacious attempt to win a second term as prime minister only weeks after he was forced to step down.

The potential candidates to replace Prime Minister Liz Truss, who dramatically quit on Thursday after only six weeks in power, were embarking on a frantic weekend of lobbying to secure enough nominations to enter the leadership contest before Monday's deadline.

Johnson, who was on holiday in the Caribbean when Truss resigned, has not commented publicly about a bid for his old job.

He has received the support of dozens of Conservative MPs, but needs to secure 100 nominations to be considered.

The trade minister James Duddridge said on Friday Johnson had told him he was "up for it".

Johnson was booed by some passengers on the plane to Britain, according to a Sky News reporter on the flight which arrived in London on Saturday morning.

Wearing a dark jacket and backpack, Johnson waved to photographers at London's Gatwick Airport before driving away.

It would be an extraordinary political resurrection for the former journalist and ex-mayor of London, who left Downing Street shrouded in scandal but grumbling that his colleagues "changed the rules halfway through" the race.

It was a swipe at the Conservative MPs who did not allow him to serve a full term.

Former defence minister Penny Mordaunt became the first candidate to officially declare an intention to run to be the next leader of the Conservative Party, but Johnson and Rishi Sunak, once his finance minister, led potential contenders ahead of voting next week.

Sunak, who was runner-up to Truss in the previous leadership contest and has yet to formally declare his candidacy this time, did not speak to reporters when leaving his London home on Saturday.

Ex-interior minister Priti Patel announced her support for her former boss Johnson on Saturday, saying he had "the mandate to deliver our elected manifesto and a proven track record getting the big decisions right".

But her colleague Andrew Bridgen said he would consider resigning from the parliamentary group if Johnson returns and warned the Conservatives against developing a "personality cult" around the former prime minister.

Dominic Raab, a foreign minister under Johnson, said the party risked going "backwards" if he returned.

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Nathan Cleary says the battle for the Australian halfback spot with Daly Cherry-Evans is the furthest thing from his mind despite making an ominous start to life as a Test international.

Cleary fell two points short of the record points haul for a debutant set by Andrews Johns (30 points v South Africa, 1995) as he played a lead role in Australia's dominant 84-0 World Cup win over Scotland.

The Panthers halfback gave the Kangaroos a look into their long-term future when he laid on three tries, scored one of his own and kicked 12 goals from 15 attempts.

In the short-term, however, head coach Mal Meninga has a decision to make as the knockout stages approach.

Head coach Mal Meninga said Cleary would now feel "like part of the team" after being rested for the tournament opener following his exploits in Penrith's premiership triumph.

Australia have one final group game against Italy next week where Cherry-Evans and Cleary are hoping to push their case to become the Kangaroos' chief playmaker for the finals.

Meninga won't be drawn into indicating where his loyalty lies and Cleary, publicly at least, says he is more than happy to take a backseat.

"I don't really think about that (rivalry with Cherry-Evans)," he said.

"I'm just trying to enjoy the moment ... I think it's a bit of a media beat-up.

"Cherry and I get on well, if I get picked or not ... I'm happy either way."

If he was trying to play it low key, Cleary didn't do a very good job and would have left Meninga with an even greater headache as he led Australia's ruthless 15-try demolition against the Scots on a rain-soaked night in Coventry.

"That's the values we have," Cleary said. "It's not about who we are playing or where we are.

"We want to play well and play hard for each other.

"I just want to put my best foot forward for the team and try and make the team better."

The 10, 276 fans at Coventry Building Society Stadium were treated to a procession from start to finish with Josh Addo-Carr grabbing four tries and Campbell Graham, who could well have been playing for Scotland at this tournament, securing a hat-trick on debut.

Australia were so dominant that Scotland had just one play-the-ball in the Kangaroos' 20-metre zone and even that came in the dying minutes of the game.

Meninga opted to give skipper James Tedesco an early night after scoring a try straight after half-time.

Valentine Holmes got a stint in the No.1 role as Jack Wighton grabbed a double and Isaah Yeo, Ben Hunt, Matt Burton and Angus Crichton helped Australia hammer home their superiority.

It was a tough night for Scotland. Six years ago they secured an historic draw with New Zealand at the Four Nations but are some way off that level now.

The Bravehearts only had one established NRL player - Euan Aitken - in their side and the defeat was the biggest in their history.

"We were playing against the best players in the world," said Scotland's Nathan Graham, adding "75 per cent of our players are part-time players and it's a massive ask to step up to this level."

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