Continuous rains in New South Wales caused flash flooding, and emergency services responded to more than 2,000 calls and assisted with evacuation.

This was responded to the north-central coast of NSW and much of the Hunter region, with 22 flood rescues overnight.

Taree has experienced the worst rainfall, exceeding 160mm in six hours since 9 a.m. Monday.

"The few floods we've been doing, some of the flood relief we've done is for people in houses that are rising rapidly on the floor, they have to move again, and it's all brought to safety," Dallas Byrnes said.

Burrell Creek resident Lisa Mumford was flooded in the property between Taree and Wingham after cutting the passage along the flood at Bucketts Way.

"It's raining all night. It's really raining, but there's no rest," she said.

"The creeks have been lifted. They are all much taller than normal and are rising. You have causeways that are no longer available, bridges and driveways that are unavailable."

Mumford said schools, including local Tinonee public schools, have been closed and some parenting centers are operating in a reduced capacity for staff.

"This is a major rainfall event. We're seeing access to services and the towns being completely blocked, and the forecast is that it will continue, which means the potential for waterways to rise remains."

Dheera Smith was a former Coast Councilman and a resident of Mondrook near Taree. As the water level rises, she was also flooded after the bridge (including Wingham’s Bight Bridge) included Wingham’s Bight Bridge.

"I looked down at the (Manning) River. It's usually pasture, but now the river is covering it all."

“It was raining all night. The water meter was full.

As of Tuesday morning, SES received 2,000 calls in 24 hours, responding to 1,400 incidents, evacuated 60 people and conducted 22 flood rescues.

Smaller warnings say floods are flooded throughout the Mid-North Coast and Hunter area, while people in the Tower are advised to take refuge.

The SES asked people from isolated sites in the area to evacuate, including in Dungog, Paterson, Gloucester, Bulahdelah and Chinchester Dam.

“We asked the community to really, really realize their location…we saw a lot of local creeks rising very quickly,” Burns said.

“We have received a lot of rescue from people entering the flood (but) we have also made majority seats from people who just entered the wrong place and the overflow of mountain floods surprised them.”

NSW Prime Minister Chris Minns said 1,600 SES personnel had been deployed, 68 schools were closed and emergency centres, including Taree, were opened.

“We ask for common sense, a sense of community,” he said.

"These are resilient towns. They have experienced a lot before. We hope and pray that there will be no events for the next 24 hours, but we are ready just in case."

Jenny Aitchison, secretary of roads and regional transport and member of Maitland, warned people in affected areas not to drive through floods.

"In the last 24 hours, I've seen some horrible videos in the Newcastle area and among hunters who drive through the flood," she said on Tuesday.

“Just driving through a 30cm flood can significantly transfer your car and lose control. You don’t know what damage is happening under that car, under the surface of that road.

“When you bring your car into the flood, you risk not only your own life, but the lives of those who will try to save you.

The Bureau of Meteorology predicts that rainfall levels in six hours range between 60 and 100mm in the Central Coast and in part of Hunter, and in isolated locations, rainfall levels of 190mm are at 100mm.

While destructive winds and surfing are expected to ease later on Tuesday, extreme weather has been tilted for several days.

"Heavy waterfalls will remain a risk, especially throughout the central and northern coasts, where flashes and river flooding continue to be major issues," said Sarah Scully, senior meteorologist at BOM.

“As a lot of water accumulates in a few days, affecting roads and low-lying areas, dangerous driving conditions, traffic and transportation delays and detours will be expected to continue to occur, and some local submersion will continue to occur.”

More than 30 schools will be closed on Tuesday in the Central Coast, Central Coast and Hunter areas due to flooding. The NSW Department of Education reminds parents that schools have not provided minimal supervision during flooding incidents.

The train did not run between Scone, Upper Hunter and Newcastle.