Southeast Queensland is on the highest alert after torrential downpours on Thursday brought severe flash flooding.
The worst hit area was Caboolture, north of Brisbane, where several people were rescued after attempting to drive through floodwaters.
Bureau of Meteorology senior meteorologist David Crock said the rain was "going nowhere in the short term".
He said severe thunderstorms and further heavy rain were possible on Saturday across large areas of central, western and eastern Queensland, from the Central Highlands to the southeast.
"The atmosphere is full of moisture," Mr Crock said.
"It's very humid, so any rain that does fall - particularly if showers fall in one spot over a number of hours - those rainfall totals can accumulate really quickly.
"With so much rain over the past week, particularly across southeast Queensland, rivers and creeks will respond really quickly to any further rainfall."
He said thunderstorm activity was forecast to peak on Monday as a cold front swept across southeast states, bringing even more instability to the atmosphere.
Southeast Queensland is again forecast to be hardest hit, with severe storms likely to hit Brisbane, the Gold and Sunshine coasts, Toowoomba and beyond.
Mr Crock said once the cold front had pushed the storms through, the state would finally enjoy a short-lived reprieve before another round of storms next weekend.
Flood warnings are current for the Maroochy and Mooloolah rivers on the Sunshine Coast and the Stanley River, Warrill Creek and the Bremer River in the Brisbane and Lockyer valleys.
Western Queensland is also on alert, with warnings current for the Warrego River at Charleville, the Bulloo River in Quilpie and the Barcoo River at Blackall.
31°C