NSW is being hit by the tail of the storm cell that has wreaked havoc in South Australia.
The weather bureau has warnings in place for damaging winds and potential flash flooding on Thursday for much of the state, but has revised down warnings for heavy rains.
Broken Hill has borne the brunt of the destructive winds, with gusts reaching up to 90km/h.
Thunderstorms are hitting towns in the north of the state along the Queensland border.
The Riverina, central and south tablelands and parts of the Hunter, Snowy Mountains and mid-north coastal regions are all on alert.
Towns in flood-ravaged central NSW are also being told to prepare for potential flash flooding and further flooding in the next few days.
The central west community of Forbes could be inundated by a second peak of the Lachlan River at the same time the town's weekend floodwaters reach downstream Condobolin.
The SES predicts the high water marks will occur sometime next week, with 30mm of rain expected on Thursday and up to 20mm on Friday.
At least 50,000 sandbags have been transported into the towns from Maitland in the Hunter Valley and extra crews have been brought in from around the state.
About 100 properties remain subject to an evacuation order while sittings at courthouses in Forbes, Condobolin and Lake Cargelligo have been cancelled for next week.
The SES is calling on those going to the Deni Ute Muster or travelling inland to check for potential road closures.
