SEVERE weather is expected to lash the Hunter on Sunday afternoon, prompting warnings from authorities for the region to prepare its properties.
The NSW State Emergency Service has flagged minor flooding on a raft of rivers including the upper Hunter, Gloucester and Manning when an inland low pressure system deepens overnight.
The Bureau of Meteorology warns a humid tropical airmass over northern NSW is ahead of an upper trough shifting into NSW.
"A trough lying through the inland north of the state is expected to develop into a low pressure centre this afternoon," it said. "Meanwhile, a coastal trough is expected to develop along the Mid North Coast."
Heavy rain and potential flash flooding are expected in northern parts of the region late on Sunday afternoon.
The conditions are due to continue overnight into Monday, the bureau said, with falls of between 80mm and 120mm over three to six hours possible.
"There is also some risk of localised damaging wind gusts in the warning area on Sunday night if a small low pressure centre develops near the coast," the bureau warned.
"Locations which may be affected include Port Macquarie, Taree, Newcastle, Scone, Maitland and Nyngan."
In the Central West slopes and plains, 60mm to 80mm is expected to fall before conditions ease on Sunday.
The State Emergency Service advises that people should:
* Don't drive, ride or walk through flood water.
* Keep clear of creeks and storm drains.
* If you are trapped by flash flooding, seek refuge in the highest available place and ring 000 if you need rescue.
* Be aware that run-off from rainfall in fire affected areas may behave differently and be more rapid. It may also contain debris such as ash, soil, trees and rocks.
* After bushfires, heavy rain and the loss of foliage can make the ground soft and heavy, leading to a greater chance of landslides.
* Stay vigilant and monitor conditions. Note that the landscape may have changed following bushfires.
* For emergency help in floods and storms, ring your local SES Unit on 132 500.
