The wet weather in Sydney has caused havoc on the roads and railway lines.
There has been flash flooding at Mascot, Bondi Junction as well as Newtown and Enmore.
Heavy rain had partially closed the south coast train line between Waterfall and Thirroul, south of Sydney, but that has now been reopened.
The Bureau of Meteorology says around 17 millimetres of rain fell in 30 minutes, hitting Sydney's CBD around 6.30am (AEST).
The initial forecast had been for some isolated showers, but it has been much heavier than expected.
Ben Domensino from Weatherzone says this morning's downpour is the worst of it, and it will move on quickly.
"The models started to show it early this morning, we saw a change moving up the coast and it seemed to target Sydney with a lot of the moisture which has been coming in off the waters," he said.
"The good news is that it'll push through quite quickly.
"It's expected to ease, it's already easing through southern parts of Sydney, and as it pushes through the upper north shore we'll see most of Sydney easing back, to those scattered showers, so it's unfortunate that it's come at peak hour," he said.
© ABC 2013
18:04 EDT A baby aged 12 weeks, a toddler and their parents are struck by lightning during thunderstorms on the Gold Coast.