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2000 Homes Uninhabitable As New South Wales Prepares For More Extreme Weather

A severe weather warning has been issued for eastern NSW with intense and heavy rain expected to cause more inundation in already saturated and flooded areas.

The Bureau of Meteorology warning covers the entire coast from Coffs Harbour in the north to Bega in the south.

There's the chance of a thunderstorm, large and powerful surf as well as flooding that may reach levels similar to last week.

Meanwhile, Premier Dominic Perrottet has apologised to the thousands of people in the Northern Rivers district whose homes and businesses were destroyed when their towns were inundated by floodwaters last week.

Many have since struggled to access basics such as food, water, power, fuel, phones, the internet as well as medical supplies.

"I'm very sorry ... but we're doing everything that we can," Mr Perrottet told the Nine Network from Lismore.

Many of the affected communities were isolated, with emergency services unable to access them during torrential rain and the emergency response would be reviewed, he said.

"Some of those areas will look back at this and say it could have been done better but ... we're doing absolutely everything we can to provide care and support for those who need it to get those essential supplies in," he said.

The ADF had arrived to help with the "mammoth" clean-up with 2000 people on the ground across the Northern Rivers.

"We're getting supplies in. We're getting food in," he said.

Around 2000 of the 3500 homes assessed in the Northern Rivers are no longer habitable so the immediate challenge will be providing short-term and medium- to long-term accommodation.

The BOM says heavy rain will continue, with the peak in the Sydney Metropolitan and Illawarra districts on Monday night and Tuesday,.

The State Emergency Service had another 550 calls for help overnight and performed nine flood rescues.

SES Deputy Commissioner Daniel Austin says volunteers are waiting with "bated breath" to see what the latest east coast low brings.

"We're certainly on high alert from the Mid-North Coast down into the Shoalhaven," he told the Nine Network.

"I would expect .... another batch of warnings and evacuation orders potentially for a number of catchments.

"We are watching exceptionally closely a number of catchments that are going to come very close to, potentially, tops of levees ... around the Hawkesbury and Central Coast and places.

"The water hasn't retreated yet. We're now going to see more flooding on top of what we've already seen."

Rain is causing significant travel delays with cancellations expected on most Sydney Trains, NSW TrainLink Intercity and Regional trains services.

Trains will run to a changed timetable and commuters are being advised to allow extra time and avoid non-essential travel.

Drivers are also being told to avoid non-essential travel on the roads.

The heavy rain could lead to flash flooding in Sydney, Mid-North Coast, Hunter, Illawarra, South Coast, and parts of the Tablelands.

Six-hourly rainfall totals between 70mm to 120mm are possible on the east coast.

"Thunderstorms may deliver heavier totals over short time periods," the BOM said.

Multiple flood warnings are current for parts of NSW, with the Hawkesbury and Nepean regions in danger of more moderate to major flooding.

Moderate flooding is happening at Windsor, Sackville, Lower Portland, and Wisemans Ferry with minor flooding at Penrith.

Thunderstorms could also bring intense rain to the Northern Rivers. Damaging winds and large hail could hit Lismore and nearby towns which are trying to clean up from last week's devastation.

The flooding has claimed six lives, including four in Lismore.