Drivers swept off flooded Queensland roads as west...
Explore Councils by state
Further north, more than 100 millimetres of rain fell around Mackay, with 165 millimetres at Mt Vince East and 103 millimetres to the south at Samuel Hill.
Bureau of Meteorology forecaster Rosa Hoff said that heavy rain was unrelated to the ex-tropical cyclone system still moving across the south-west corner.
"We've had a coastal trough which has pushed into the Mackay region," she said.
Police had responded to three incidents on Wednesday morning in the region - at Oakenden, Palmyra and Sandy Creek - where drivers tried to cross flooded roads.
On Tuesday, a man was airlifted to safety after spending more than a day trapped in his car in floodwater near St George.
Loading
The south-east is also expected to see some increased shower activity into the end of the week as a trough pulls a cloud band toward the coast.
Up to 10 millimetres is forecast to fall on Brisbane Saturday and Sunday, with lighter falls Friday and Monday.
Similar totals are predicted west into the Lockyer Valley and along the Gold and Sunshine coasts.
"It can take seconds for any vehicle to be pushed from the roadway by the force of flooding water and place drivers, passengers and potentially emergency services in a position where their lives can be threatened," police said in a statement.
Most of the storm activity was affecting inland parts of Queensland, with a severe weather warning issued by the Bureau of Meteorology for parts of Channel Country and the state's north-west.
With 67mm of rain to 9am, Birdsville had its wettest day since March 2011. Boulia, about 380 kilometres north, recorded 78 millimetres, while Thargomindah Airport saw 70 millimetres fall.
Western catchments likely to be impacted include the Paroo, Bulloo, Barcoo, Thompson, Georgina and Diamantina rivers, along with Cooper and Eyre creeks. Many are already in flood.
Heavy rainfall in the Warrego was expected to stay downstream of Charleville - which experienced major flooding late last month - and also spare St George, hit by a major Balonne River flood peak last week.