A trough is generating storms, some severe, over eastern parts of Victoria, New South Wales, and Queensland.
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More rain is forecast across NSW today after parts of the Northern Rivers was flooded yesterday.(Josh Dye)
In NSW, a severe storm warning is in place for a large part of the state with damaging winds also expected to hit the Sydney Coast, Illawarra Coast, Batemans Coast and Eden Coast.
The conditions come after low-lying areas of the NSW Northern Rivers to become submerged after a deluge of more than 200mm of rain in a period of about seven hours.
Around 40mm of rain could fall today.
Authorities say the conditions have not been seen since Cyclone Debbie in 2017.
An evacuation order is in place for Condong, Tumbulgum, Tygalah and surrounding areas along the Tweed River.
The SES says it s the final flood warning for the Tweed, with waters likely to begin receding today allowing for a clearer picture of the damage below.
A series of minor flood warnings have been issued for other rivers in the region.
Further south near Coffs Harbour, a high tide is likely to hit at 10.30am.
The weather bureau has predicted possible flooding for low lying areas in the North Macksville areas.