The Bureau of Meteorology said there was a risk of more heavy falls on Tuesday after the area was lashed with rain on Monday.
"This situation continues to be dangerous and dynamic," Meteorologist Miriam Bradbury said.
⚠️⛈️Detail Severe thunderstorm — Bureau of Meteorology, Queensland (@BOM_Qld) #warning just issued: Very dangerous cell with INTENSE RAINFALL, that may lead to life-threatening FLASH FLOODING slow moving near #CederCreek & #MountTamborine. It could also affect #Jimboomba & #LoganVillage. Updates: https://t.co/UykndbINjl pic.twitter.com/XBGixdJXdVJanuary 1, 2024
Isolated showers and thunderstorms are forecast across most of Queensland, with the possibility of moderate to heavy falls in parts of the state's southeast.
Nindooinbah Dam, west of the Gold Coast, and Leslie Harrison Dam, in Brisbane's southeast, started spilling excess water due to the heavy rain late on Monday and Seqwater cautioned residents downstream of the dam to avoid potential hazards such as fast flowing or deep water near waterways and flood plains.
Queensland authorities said forecast rainfall indicated that releases may be required from the North Pine and Somerset dams within the next 24-48 hours.
Severe thunderstorms and flash flooding are possible in NSW's far north coast, mainly in the morning.
The rain is expected to become patchier later in the day as the weather system moves south towards Victoria, with the possibility of isolated showers along NSW's southern and central coast.
A flood watch was issued for parts of Queensland's southeast and northern NSW on Monday, with warnings flooding was possible.
Residents of Tumbulgum, in northern NSW, were urged to prepare to be isolated by floodwater late on Monday amid moderate flooding in the area.
Further south in Lismore, emergency authorities advised people to stay informed about potentially dangerous flooding on the Wilsons River.
State Disaster Co-ordinator Shane Chelepy said on Monday the Gold Coast had been drenched, with Currumbin Creek receiving 571mm of rainfall in 24 hours, Upper Springbrook 350mm, Mount Tamborine 161mm and Pimpama more than 375mm.
Limpinwood in NSW received 307mm of rain in the 24 hours to 9am on Monday, Numinbah 297mm, Coffs Harbour Airport 205mm and Sawtell 190mm.
"Our waterways and infrastructure aren't built to withstand such a large amount of rain over such a short period," Ms Bradbury said.
15°C