Severe thunderstorms are lashing parts of southern inland Queensland bringing heavy rainfall and possible flash flooding.
Warwick, Dalby and areas north of Toowoomba are likely to be affected, the Bureau of Meteorology (BOM) said in a warning on Sunday evening.
A severe weather warning is also in place for south-east Queensland with forecasts of heavy rain on Monday into Tuesday.
"Monday will be a heavy rainfall day for south-east Queensland and people should be particularly concerned about their activities during that day," said meteorologist Jackson Browne.
Areas affected could include the Gold Coast, Brisbane, Sunshine Coast, Ipswich, Coolangatta, Caboolture, Cleveland, Gatton and Jimboomba.
"We have seen flash flooding and fatalities occur in the period between the early March floods and now with only moderate falls, and with heavy to intense falls this risk is very significant for flash flooding," Mr Browne said.
Earlier, meteorologist Shane Kennedy said the severity of the rainfall will depend on where the trough moves in coming hours, but coastal areas are considered most at risk.
"If that coastal trough stays well offshore we'll only see moderate rainfall, but if it moves closer to the coast or over land, then you can see some significant rainfall," he said.
"So we could see widespread showers, periods of rain and flash flooding as well," Mr. Kennedy added.
The south-east has already endured intense rainfall in recent weeks that has flooded homes and businesses.
Insurance assessments indicate around 4,300 properties suffered severe or moderate flood damage, and another 3,500 received minor damage.
Mr Kennedy said there was a heightened risk of flash flooding in areas hit by the south-east floods, if the trough stays onshore.
"It could stay in a similar area for several hours and then really intensify that rainfall," he said. More than 200 millimetres of rain could fall within six hours in some areas, which could lead to flash flooding.
"Certainly throughout the south-east coast we have a lot of areas that are still recovering from the recent flooding, so certainly heavy rainfall and flash flooding is the last thing they want," Mr Kennedy said.
Separately, severe thunderstorms are forecast for Sunday evening in the Central Highlands and Coalfields, Central West, Maranoa and Warrego and Darling Downs and Granite Belt districts.
BOM warns the heavy rain could cause flash flooding over the next several hours in parts of the Channel Country and Maranoa and Warrego districts.
A separate weather system also moved over Noosa on Sunday evening.
Conditions are expected to ease across the state from Wednesday.
