Severe weather warnings have been issued in the Hunter and Central Coast regions as the system that has lashed northern NSW and southern Queensland is predicted to move south.
The NSW Bureau of Meteorology has warned of gale forced winds on the coast between the Port Macquarie and Illawarra areas, with an expected east coast low to bring damaging surf, possible erosion and an abnormally high sea level south of Forster some time on Tuesday evening or Wednesday morning.
The BoM says the highest tide of the year could be broken by up to 0.2m, causing a risk of possible flooding in low-lying areas.
This is a particular concern for Wednesday morning's high tide.
A heavy rainfall warning has also been issued for Newcastle, Gosford, Sydney, Wollongong, Nowra and Batemans Bay.
"A deepening low pressure system near the Queensland and New South Wales border is moving off the coast," the weather bureau said in a warning issued early on Tuesday.
"It is then expected to drift southward parallel to the coast on Tuesday and rapidly deepen in response to an amplifying upper trough and low.
"At this stage, the system is forecast to approach central and southeastern districts on Tuesday night or during Wednesday, however, uncertainty exists on its exact timing and where the most significant impacts will occur."
On Tuesday, BoM data showed that Cooranbong had recorded 22.6mm of rain since 9am on Monday, while Gosford had 20.8mm.
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