Authorities expect rising river levels at Singleton in the New South Wales Hunter Valley and "intense rainfall" on the Mid North Coast to be among the biggest concerns today.
Residents along parts of the Hunter River were told to evacuate last night and an evacuation warning has been issued for the Singleton township.
An evacuation centre has been set up at the Singleton Heights Diggers and Cessnock Leagues Club.
Morgan Pumper from the Bureau of Meteorology says there will be more rain in the Hunter today, but the severe weather is moving towards the Mid North Coast.
Coffs Harbour has recorded close to 200 millimetres of rain in 24 hours.
More than 150mm fell in Bellingen, with more expected.
"For Newcastle, at the moment the forecast is showing 30 to 45mm," Ms Pumper said.
"For other parts of the Hunter, Singleton could see 20 to 30mm.
'Worst flood since 1949'
Major flooding is occurring at Bulga and Wollombi, with river levels at Bulga the highest recorded level since 1952.
Wollombi Tavern publican Chris Books said he could not get to the pub, but photos showed floodwater "close to being to the top of the doors and windows".
"It's bad," he said.
"We worked out this morning this is the worst flood since 1949.
Hunter Valley resident Melissa is trapped at her property just outside of Broke and has lost power.
"We're on the priority list with SES, but SES can't get in either."
Central Coast on high alert
On the state's Central Coast north of Sydney, major flooding continues to affect thousands of residents.
Low-lying areas in 19 suburbs are subject to evacuation orders.
Around Long Jetty, residents are being warned Tuggerah Lakes floodwaters could reach 1.75 metres later this morning.
Former Central Coast mayor Lisa Matthews was "shocked" when flood waters reached her Cittaway home this morning.
"I think that our lower level will start to go under and it's never happened at all here, I'm really shocked and actually quite uneasy now."
The Hawkesbury River at Wisemans Ferry peaked at 5.75 metres, with major flooding, higher than the March 2022 flood level.
On the Central Coast the SES had 700 calls for help, including more than 50 rescues and evacuations, along with 200 call-outs in the Hunter region.
Call for assistance
Acting Singleton Shire Mayor Dwight Graham said parts of the region were still recovering from the last floods.
"We're certainly still rebuilding things from the March event, this is just going to put us back again," he said.
"We have signed a request [for disaster assistance] I did that yesterday and that's been sent off.
