Thunderstorms have drenched northern NSW, raising the threat of flooding to yet another area of the state.
More than 100mm of rain fell within six hours on Friday at Moree, where moderate flooding is possible by Saturday evening.
Meanwhile, western Sydney residents are expecting minor flooding to begin on the rising Hawkesbury-Nepean rivers on Friday.
Several suburbs including Windsor, Penrith, and North Richmond have been told to monitor the conditions.
The Hawkesbury-Nepean region has already suffered two major floods this year.
The threat is being exacerbated by widespread showers and moderate falls, mostly about the slopes and ranges on Friday.
Severe thunderstorms are possible on the western slopes and parts of the state's northeast, the Bureau of Meteorology says.
"Another low pressure system is set to form over southern NSW and that will drive further showers and storms into mid-next week," senior meteorologist Jonathan How said.
"Thunderstorms have been quite hit and miss, but some locations have seen more than 100mm (rainfall)."
Major flooding was occurring in the Brewarrina shire, Warren, far western town Tilpa and along the Murray.
Moama, the sister town to Victoria's Echuca, has been the focus of the flood threat in recent days.
The river passed major flood levels late on Wednesday night and continues to slowly rise towards the 94.77m height of a 1993 flood, the area's second-worst on record.
The bureau expects it to reach around 95m next week, still below the 96.2m height of its worst flood in 1870.
Hundreds of people have been ordered to evacuate Moama and surrounds this week.
The flooding threat comes as the NSW government presses the federal government to share funding for the proposed $1.6 billion raising of the Warragamba Dam on a tributary of the Nepean River.
"This is an important project for the protection of property and lives in western Sydney," NSW Premier Dominic Perrottet told 2GB on Friday.
© AAP 2022