NSW floods continue but worst appears over

But the Bureau of Meterology has issued a severe thunderstorm warning for the Hunter and the Mid-North Coast, warning expected heavy rain could lead to flash flooding during the day.

Some 130,000 homes in the path of a spilling Warragamba Dam in the Hawkesbury-Nepean region in western Sydney got a reprieve on Thursday afternoon after being told any flooding was likely to be less than the levels seen in March 2021.

A forecast for 600 gigalitres of water to spill over the dam wall daily has been been revised down to between 300 gigalitres and 350 gigalitres.

However, the BOM said flooding was still expected at Windsor, as the Hawkesbury and lower Nepean rivers continue to rise.

The NSW SES on Friday morning told residents living around the lower areas in the town of Portland, near Lithgow, on the Hawkesbury River to evacuate and move to higher ground.

And people in the eastern part of Wisemans Ferry, 75km north west of Sydney, were on Friday morning told to get ready to evacuate properties around the town centre in the next few hours.

Further north, the Richmond River delivered major flooding at Coraki, Bungawalbyn and Woodburn on Thursday, with peaks near the record March 1974 flood level, but Casino and Kyogle fell back below the minor flood level.

The SES responded to more than 2500 requests for assistance and conducted 144 flood rescues in the 24 hours to 5pm on Thursday.

While the low pressure system that brought hundreds of millimetres of rain and devastating flooding to multiple areas in Qld and NSW over the past week was expected to ease into Friday, more severe weather could be on the way this weekend.

Another cold front on the way from Victoria will bring more rain and severe weather on Saturday, the BOM said, which could cause rivers to start rising again.

The death toll from the NSW floods event remains at five, including four fatalities in the north western town of Lismore.