The Bureau of Meteorology is keeping a close watch on a weather system off the Queensland coast, which is moving toward the mid north coast.
Modelling shows the low pressure system could bring more heavy rain to the region later this week.
Duty forecaster Jake Phillips said the system could form into an East Coast Low.
He said rainfall associated with it could lead to flash flooding in already sodden catchments.
"At this stage it's looking as though Friday and Saturday are probably the more days," he said.
"It looks like those showers will increase into some more persistent rain periods during that time.
"There is the potential for some significant rainfalls out of it too right around the north coast region.
"The ingredients are definitely there for something which could cause some problems.
"So we'll be checking it out and we do advise people to watch for the latest forecast."
© ABC 2013
18:16 EST Heavy rain has stranded about 40 people at William Creek in the South Australian outback due to flooded roads and low cloud has grounded aircraft.