Sydney, Brisbane weather: NSW and Queensland smashed by severe rain

The most severe weather will be seen on Friday, with widespread rainfall of 50mm to 100mm falling from brisbane to the south coast of New South Wales.

The reason for the wild weather is the combination of an upper-level low pressure system and a coastal trough forming off the east coast.

This coastal trough will funnel tropical moisture from the north, causing heavy rain.

Miriam Bradbury of the Bureau of Meteorology warned that the heaviest rain and strongest winds will be recorded on Friday.

“As we move through the latter part of Thursday into Friday, that’s when we’ll see the more severe weather begin to intensify as a trough deepens off the east coast of New South Wales,” he said.

“Precipitation of this magnitude can cause flash flooding.”