The Bureau of Meteorology has issued a weather warning for the Northern Tablelands, with very heavy rain expected across the Australia Day long weekend.
The northern reaches of the Northern Tablelands, including Tenterfield, could see in excess of 100mm in the next 24 hours.
The Bureau says the North West Slopes and Plains will be impacted on Sunday, with around 60mm expected to fall as the remnants of ex-Tropical Cyclone Oswald move south.
Meteorologist, Julie Evans, says a Flood Watch has been activated for eleven river systems, mainly in coastal areas.
"If farmers are looking for rain, they'll get a good drop and the initial numbers we're looking at are probably in the vicinity of 50mm to 100mm and, perhaps, locally a little bit higher than that," she said.
"Northern parts of the North West Slopes and Plains can expect some rainfall on Sunday, but we're not expecting it to be in the same ball park as the amount expected east of the Ranges."
Col Malone, from the Northern Tablelands S-E-S, says motorists need to exercise caution, particularly because winds will, at times, be gale force.
"We're looking at potential flooding in the Upper Macintyre Valley which would come down into the Inverell Shire area," he said.
"We'd like the public, particularly those out on the roads and those in town, to heed our message that if it's flooded not to go into the water."
© ABC 2013