An urgent evacuation warning has been issued for low-lying parts of a southern Sydney suburb.
The SES is advising people around Woronora, east of Cronulla, to pack medicines, important documents, spare clothing and mementos and leave the area by 11pm on Sunday.
"Do not delay your evacuation. Roads will be congested or closed," the SES warns.
"You could become trapped and need rescue. Remaining in flooded areas is dangerous and may place your life at risk."
The warning has been issued after the Woronora flooded to dangerous levels on Sunday evening and will stay in place until authorities deem the area safe.
Earlier on Sunday, residents in low-lying parts of Milperra and East Hills were told to leave home within three hours as the storm continues to hammer Sydney.
Nearby Chipping Norton was also evacuated and a major flood warning has been issued for the upper reaches of the Nepean River.
On Sunday about 70 to 90mm of rain fell across Sydney.
But the biggest concern for authorities is the surf, with a 12-metre wave recorded at Botany Bay on Sunday.
Abnormally high tides are predicted all along the state's coast and five to seven-metre waves may cause erosion and sea water flooding of low lying areas.
The storm is expected to clear Sydney on Sunday night but will smash the state's south coast for another day, dumping another 100mm on the already-soaked region, before moving south towards Tasmania.
