On Sunday, Alfred began moving as a tropical low from Queensland's Bribie Island, across the coast, and inland towards the state's southwest on Sunday.
But there is still more bad weather to come, as forecasters expect up to 700mm of rain and destructive gusts to continue through to Monday.
"Today is all about the rainfall that's likely to be experienced around southeast Queensland and far northeastern NSW," said senior meteorologist Dean Narramore.
Isolated rainfalls of up to 400mm are expected on Sunday alone with another trough from Central Australia dragging the weather activity inland over northern NSW.
Mr Narramore noted the weather system will shift wet weather to coastal parts of NSW by Wednesday and clearing mid to late week.
Southeast Queensland should start to see conditions easing from persistent rainfall on Monday.
Multiple flood warnings remain in effect for the Tweed, Richmond, Wilsons, Clarence and Bellinger rivers in NSW.
On Saturday 32 Australian soldiers deployed to assist in the storm and flood response were involved in a truck accident near Lismore.
Thirteen soldiers were injured, with two remaining in a serious condition in hospital.
One truck rolled several times into a paddock and the other tipped over as the driver attempted to avoid the first vehicle, NSW Police said.
The injured were taken to local hospitals, with Prime Minister Anthony Albanese calling them "heroes who were on their way to help people in need".
The weather event has already claimed one victim with a body found believed to be that of a 61-year-old man.
The man's ute was swept into floodwaters at Megan, about 25 km north of Dorrigo in NSW on Friday.
He was able to climb into a tree about 30 metres from the riverbank but was swept away before emergency personnel could reach him.
A family of eight driving in rapid floodwaters were among those rescued by emergency crews in northeast NSW.
In a temporary sign of relief, Premier Chris Minns said the evacuation warning for Lismore's CBD had lifted, meaning people could cautiously return to their homes.
But areas around the Clarence River were still on high alert.
"This is a fluid situation, the rain is falling unevenly across the catchment and as a result the bit of advice is different for valleys and communities," he told reporters in Lismore.
"Although there are encouraging signs... we're not out of the woods yet."
"One of the big lessons out of the 2025 tropical cyclone compared to 2022 (floods) is pre-deployment, early warning and the most available, accurate information to the public."
Emergency crews rescued 21 people who had driven into floodwaters in the past day, as the SES urged people not to risk their lives by ignoring the strict warnings.
Nearly 50 rescues have taken place so far in the latest flood event.
Around 15,000 people throughout NSW are still under 36 evacuation warnings, with NSW North Coast Minister Rose Jackson noting 800 have sought shelter in the state's 21 evacuation centres on Sunday.
Across the border in southeast Queensland, there are signs of life slowly coming back to normal, even though power outages are still affecting residents with 100,000 losing electricity overnight.
