Parts of New South Wales and Queensland are expected to be drenched with as much as 300mm of rain as two weather systems merge to wreak havoc on the east coast.
Weather agencies have warned those living from south-east Queensland to the NSW south coast are in for a miserable few days from Thursday to Saturday.
There will be massive rainfall over the next 72 hours, with 300mm forecast along the east coast and 200mm possible in isolated areas.
Sydney could receive up to 100mm of rain on Friday alone.
The wild weather will also bring something known as Black Nor’easter, where a violent storm with black clouds plunges areas into darkness even in the middle of the day.
Parts of New South Wales and Queensland will be drenched with as much as 300mm of rain in the coming days as two weather systems merge
The heaviest weather will be seen on Friday, with widespread rainfall of 50mm to 100mm expected to fall from Brisbane to the NSW south coast.
Sydney, the Blue Mountains and the Illawarra region could be drenched with as much as 200mm to 300mm of rain in the coming days, Weatherzone’s Joel Pippard said.
“Some models show rainfall of up to 80-150mm in just six hours, with heavy thunderstorms possible in these regions,” he said.
‘Similar heavy falls are also possible for the NSW Northern Tablelands, North West Slopes and Plains and Queensland’s Darling Downs and Granite Belt during Thursday and Friday morning.’
Weather agencies have warned those living from south-east Queensland to the NSW south coast are in for a miserable few days from Thursday to Saturday.
Thunderstorms are also possible over northeastern NSW and southeastern Queensland on Thursday afternoon.
High swells and gusts of up to 100 km/h are also forecast.
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 drain tropical moisture from the north, resulting in intense rainfall.
Miriam Bradbury from the Bureau of Meteorology warned that the heaviest rains and strongest winds will occur on Friday.
“As we move through the latter part of Thursday into Friday, we will see the most severe weather begin to increase as a trough deepens off the east coast of NSW,” she said.
“Rainfall of this magnitude could lead to flash flooding.”
The wild weather will diminish on Saturday as the system moves further south.
Sydney could receive as much as 40mm of rain on Thursday, while the forecast for Friday says between 25mm and 100mm of rain is possible.
There will be massive rainfall over the next 72 hours, with 300mm forecast along the east coast and 200mm in isolated areas.
Up to 50mm is forecast for Saturday, while the sun will finally emerge on Sunday for a warm day of 28 degrees.
Wollongong, south of Sydney, could see as much as 130mm of rain on Friday and 80mm on Saturday.
Further south, Batemans Bay will also see rainfall, with up to 100mm on the horizon for Saturday.
Katoomba in the Blue Mountains could be hit with as much as 150mm on Saturday.
Brisbane is also in the firing line as up to 70mm of rain could fall over the next three days.
Canberra will also be hit by rain, with up to 40mm forecast on Friday, and up to 45mm on Saturday.
Melbourne will miss the miserable weather with dry and partly cloudy days forecast for the end of the week.
Those in Adelaide will enjoy a dry and sunny weekend, as will those in Perth, where temperatures could soar into the 30s.
Darwin will see some possible showers over the next few days.
The bad weather will ease on Saturday afternoon