Two weather systems are causing more pain for NSW residents in already flooded areas as emergency services prepare more people for evacuation.
Lismore residents in the state's Northern Rivers region were told to prepare to evacuate on Sunday night, with a weather system on the NSW-Queensland border expected to dump up to 200mm of rain in parts.
Meanwhile, a second system was travelling across the border from South Australia, bringing more rain to already saturated parts of the state.
There are more than 120 emergency warnings in place, including 20 evacuation orders.
Authorities are pleading with people not to drive through floodwaters with a frustrated Premier Dominic Perrottet saying they are tying up resources and risking lives.
NSW's SES had performed 34 rescues in 24 hours as of Sunday afternoon, on top of hundreds of calls for help.
Emergency Services Minister Steph Cooke said every corner of the state had a flood warning.
The areas of most concern were in the state's north, with waters rising in places including Moree and Gunnedah.
Evacuation orders are in place for Moree, Terry Hie Hie, Gunnedah and Carroll in the state's north, the Riverina town of Narrandera and Mudgee in the central west.
Residents have also been ordered to higher ground at Cummeragunja, Mathoura East, Murray Valley and Moama on the Murray River.
Two hundred Australian Defence Force personnel have been deployed across the state with more than a dozen helicopters helping with rescue and relief efforts, including three defence choppers.
SES Commissioner Carlene York urged residents to evacuate when ordered.
Rapid damage assessment crews would be working to give residents the green light to return home as quickly as possible.
Natural disaster declarations have been made in more than 40 local government areas, opening councils, residents and businesses for financial aid.
© AAP 2022