Appearing Premier Paul Toole mentioned at this time a moist forecast for April may result in floodwaters rising as soon as once more.
"We could also be on this state of affairs, coming again once more, in a couple of weeks' time," he mentioned.
"April is predicted to be fairly moist in lots of elements of the state."
With the bottom already waterlogged from well-above-average rainfall to start out the 12 months, Mr Toole mentioned it would not take far more precipitation for rivers to interrupt their banks.
"If you take a look on the floor, it's saturated," he mentioned.
"We solely need to see a small quantity of rainfall touchdown in a few of these areas...
"It would not take a lot rainfall to see these rivers working once more, encroaching their banks, seeing riverine flooding, flash flooding inside these communities."
Mr Toole's warning got here as Lismore skilled its second spherical of devastating flooding since late February, with waters breaching the city's levee and forcing the evacuation of the CBD this morning.
Flash flooding additionally hit Byron Bay after greater than 400 millimetres of rain fell in elements of northern NSW.
The Bureau of Meteorology mentioned yesterday the La Nina system which has been driving a lot of the rainfall has "barely weakened" prior to now fortnight and is because of end by the tip of autumn.
Newcastle residents captivated by a frothing foaming seashore
Nonetheless, it warned the system continues to be anticipated to affect climate over the subsequent two months.
"La Niña occasions enhance... the possibilities of above-average rainfall throughout massive elements of jap Australia throughout autumn," the BoM mentioned in its local weather driver replace.