On the northern beaches, the Wakehurst Parkway reopened after earlier being closed in both directions between Oxford Falls and North Narrabeen due to flooding. Motorists were advised to use Pittwater Road or Warringah Road instead.
Before 7am on Monday, rainfalls of more than 100 millimetres were recorded at Bellambi, in Wollongong, Lake Macquarie, in the Hunter region, and Mangrove Mountain on the Central Coast since 9am on Sunday.
In Sydney, Observatory Hill saw more than 72 millimetres of rain in the period, and heavy falls were also recorded at Terrey Hills (80.6 millimetres) on the northern beaches, Sydney Olympic Park (76.2 millimetres), and Canterbury (75.6 millimetres) in Sydney’s inner west, with reports of flooding in the inner west late on Sunday night.
State Emergency Service volunteers attended 498 callouts between 6pm on Sunday and 7am Monday, including 164 in the Sydney region.
Close to 300 incidents attended by the SES were in the Central Coast and Hunter regions on Sunday night as the east coast low moved south after causing flash flooding on the Gold Coast earlier on the weekend.
Volunteers attended seven flood rescue incidents in the area, including one involving a group of nine children stuck on a bus filling with water at the University of Newcastle at Callaghan on Sunday afternoon.
Residents of Terrigal Beach at Wamberal on Central Coast watched as high waves hit their shores after the council piled up more than 150 rock-filled bags to attempt to stop ongoing coast erosion in the area.
State member for Newcastle Tim Crakanthorpe shared footage of flooded roads at Mayfield, in Newcastle, on Twitter on Sunday afternoon.
Strong winds were recorded south of Sydney early on Monday morning, with Belambi and Kiama, on the South Coast, each recording wind gusts of 91km/h before 2am.
The winds may extend north to Sydney and possibly the Central Coast on Monday afternoon. Average winds of 60km/h to 70km/h have been forecast, with gusts of up to 90 km/h.
The SES has advised people to move parked cars from beneath trees, keep at least 8 metres away from fallen power lines and not walk or drive through water.
The wind and rain will ease Monday evening or early Tuesday morning.
“It’s important to remember to stay away from floodwaters, even as conditions begin to ease,” SES spokesperson Andrew McCullagh said.
Get our Morning & Evening Edition newsletters
Mary Ward is a reporter at The Sydney Morning Herald.