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Campers at the Bathurst 1000 are bracing for muddy, stormy and potentially dangerous conditions as a large rain band crosses central and eastern NSW.

A trough and cold front moved across the state on Friday, bringing further widespread rain to the eastern half of NSW, including the western slopes and ranges, central NSW and the south coast.

The weather bureau has placed many eastern catchments on flood watch, including Hunter and the Greater Sydney regions, as it waits to see exactly where the most intense rainfall occurs.

"Behind the rain band, there is a lot of convection which means we're getting some really decent thunderstorms," a bureau spokesperson told AAP on Friday.

Up to 100mm of rain could fall at motorsport mecca Mount Panorama over the weekend, potentially leading to flooding along the Macquarie River in Bathurst.

Severe thunderstorms could also bring damaging winds to the region.

Free sandbags will be available in Bathurst while volunteers are checking in with residents and tourists camping near the Macquarie River.

Deputy Premier Paul Toole urged campers on the mountain and elsewhere to stay away from trees and riverbanks.

Meanwhile, the priority car park at the Bathurst 1000 closed on Friday to all but four-wheel-drives, and those in the muddy general carpark were asked to have "appropriate footwear".

"A further update will be provided for Saturday and Sunday parking dependent on the weather conditions," organisers said.

Saturday is set to be a high-risk day for Sydney, with warnings of renewed river flooding to the city's west, months after record peaks were observed.

The SES has warned people near Penrith to stay informed about predicted river rises in the Nepean, Hawkesbury and their tributaries.

"We're very conscious your communities have experienced four floods within an 18-month period and acknowledge the anxiety you will be feeling at this time," Emergency Services Minister Steph Cooke said on Friday.

Conditions will ease briefly on Saturday morning before a low-pressure system forms along the coast in the afternoon, bringing renewed rain in the evening.

Rain could continue in eastern parts of the state into Monday, the bureau warns.

Statewide, the SES received 365 calls for assistance in the 24 hours to Friday morning, including four for flood rescues.

Cotton town Warren, where waters have been above the major flood level since Monday, is subject to one of more than a dozen watch-and-act flood alerts in NSW.

Major flooding is possible on the Gwydir, Namoi, Macquarie, Belubula, Lower Hunter, Colo, Lachlan and Bogan rivers, Mandagery Creek and Wollombi Brook.

Renewed flooding is occurring or possible on the Murrumbidgee, Murray, Edward, Culgoa, Birrie, Bokhara, Warrego, Paroo, Barwon and Darling rivers.

Inland towns being monitored closely include Gunnedah, Narrabri, Tamworth, Dubbo and Forbes.

Emergency services don't want people entering flooded causeways and other river crossings, police said.

"It wasn't very long ago we had a five-year-old boy ... who was killed in a car that was washed off a bridge," NSW Police superintendent Bob Noble said, referring to an incident in Tullamore two weeks ago.

"You can imagine how devastating that is for that family. It's a terribly hard way to learn a lesson for society."

More than 90mm fell at Sydney's Observatory Hill on Thursday, helping topple the city's annual rainfall record set in 1950.

© AAP 2022

Brittany Higgins has vehemently denied pretending to have booked doctor's appointments in the week after her alleged rape to "bolster" her story.

The former Liberal Party staffer is being cross-examined as the first witness in the criminal trial of Bruce Lehrmann, who has been accused of raping her in Parliament House.

He has pleaded not guilty to sexual intercourse without consent.

Ms Higgins earlier told the court she made the appointments with every intention of going but due to her depressive state she was not physically able to attend.

Defence lawyer Steven Whybrow put to Ms Higgins she did not go to the doctor because she had not had sex with anyone.

"That's not true," she told the ACT Supreme Court on Friday.

Mr Whybrow suggested Ms Higgins had told her former partner Ben Dillaway and chief of staff Fiona Brown about the appointments to "bolster" her rape allegation.

"Nothing you are saying right now is true ... and it's deeply insulting," Ms Higgins said.

She told Mr Whybrow she didn't know if he had experienced trauma before but that it was a difficult thing to confront head on.

"I don't know what you want from me," she said.

Mr Whybrow also put to Ms Higgins she did not tell Ms Brown about the alleged assault in a meeting the following week.

He suggested the meeting was rather about the security breach, which was reported to Ms Brown as a result of Ms Higgins and Lehrmann accessing a ministerial office late at night.

"I obviously disagree with that completely," Ms Higgins said.

She confirmed she deleted some messages and photos from her phone before handing it over to police.

The jury heard it was not her intent to keep information from the officers investigating her alleged rape.

Asked by Mr Whybrow if she remembered deleting the messages, Ms Higgins said "potentially".

She told the court she cleared her phone of photographs showing her holding alcohol or with politicians.

"I wanted to scrub all the horrible parts of my life out of my day-to-day existence," she said.

Ms Higgins described her phone as her "life" and said she didn't want to see photos of former minister Linda Reynolds, for whom she worked when the alleged assault happened.

"I didn't want to see her face ... Sorry, she's not a bad person. But it is what it is," she said.

Ms Higgins sent a number of audio files to her boyfriend David Sharaz before giving her phone to police when she reopened her complaint in 2021, because she worried they would be lost.

She denied withholding the audio from the police and said she provided the recordings on a USB along with her phone.

Ms Higgins was terrified senior Liberal ministers would find out about her reopening the complaint.

She became emotional as the recalled then-home affairs minister Peter Dutton knowing about her wish to reopen the case before she had given evidence to police.

"I know how information flows in the ministerial wing. I know that it's not siloed," she told the court.

"I was seeking legal advice to know my rights because I was terrified."

The trial continues.

© AAP 2022

Queensland police union members "could be" making sexual harassment complaints about their colleagues in the force as often as once a month, an inquiry has been told.

Queensland Police Union of Employees president Ian Leavers is giving evidence at a probe into police responses to domestic violence.

Counsel assisting Anna Cappellano asked him on Friday if union members were making sexual harassment complaints about colleagues as frequently as once a month.

"It could be, yes," Mr Leavers replied.

Ms Cappellano then asked if new complaints were being made every week.

"No, probably not," he said.

This week's hearing has been told multiple female officers have been sexually assaulted, harassed, threatened and bullied.

It has also been told police officers have voiced misogynistic and racist views and there's a pervasive fear within the force about speaking out.

Earlier on Friday, Mr Leavers said "there is some abhorrent behaviour" and attitudes in the force but only in "small pockets".

He said most police officers called out bad behaviour by their colleagues.

"What I do say is 98 per cent of the people that I represent are doing the right thing each and every day," Mr Leavers said.

"I do think it needs to be called out, it needs to be addressed, but we need to dive deeper as to why it is occurring and what can be done as we move into the future."

He also revealed a female officer who was "very close" to him had been subjected to abusive behaviour by a colleague.

His voice wavered as he spoke about finding out what the male perpetrator said and did.

"At that time I wanted to throttle that person," Mr Leavers said.

"I'm a law-abiding person. I haven't done that but it deeply affected me and others, so I'm acutely aware of what takes place.

"But I can say the majority of police are doing the right thing but those people, that behavior, is not acceptable."

Counsel assisting Ruth O'Gorman asked him about his comments about former Court of Appeal president Margaret McMurdo's landmark domestic violence report, which called for the inquiry.

In December, Mr Leavers called it "another woke, out-of-touch report" in a radio interview.

He defended his comments as being made in frustration at another potential inquiry when numerous past probes had not led to changes to the system that helped police reduce domestic violence rates.

Judge Deborah Richards asked Mr Leavers if he accepted such language potentially "reinforces views within the police service that are unhelpful".

"I can accept some of that but I ask you to accept my frustration because I want to fix the broken system," he said.

"And my intention was never to denigrate women or any other person ... I want to fix a broken system which I hope does get fixed."

The inquiry continues.

© AAP 2022