Sydney flooding: Emergency services say rescues are underway.

State Emergency Service crews are carrying out more than half a dozen rescues after heavy rain swept across Sydney.

The Bureau of Meteorology said 49mm of rain had fallen in an hour at Marrickville and 45mm in Canterbury.

SES spokeswoman Becky Gollings said volunteers were responding to seven separate flood rescues around Glebe, Marrickville, Alexandria and Zetland.

“It’s concerning for us that people are putting themselves in danger. We just want them to stay out of floodwaters,” she said.

On King Street, rain forced the evacuation of the Supreme Court building and dozens of people, including those involved in criminal trials, were ordered to leave.

An alarm was triggered and stormwater could be seen leaking into parts of the historic building, although the building has now reopened to the public.

Roads were inundated while some shops reported at least two inches of water on their floors.

There were also lengthy delays for motorists and airline passengers.

Motorists are experiencing lengthy delays because the rain has led to flooding on some major city roads.

There is only one westbound lane open on the Anzac Bridge in Sydney’s inner-west.

Motorists were being advised to slow down and exercise caution. Buses across Sydney were also experiencing delays.

A section of the light rail is not operating between Central and Dulwich Hill because of flooding at various spots along the line.

Sydney Airport has confirmed airlines are experiencing delays and warned flights could be cancelled.

This post originally appeared on ABC News.

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