Storms bringing lightning and torrential rain have hit parts of south-east Queensland already devastated by flooding.
The warning of more severe weather prompted evacuations and the Premier Annastacia Palaszczuk to ask parents in the northern part of Moreton Bay, Sunshine Coast, Wide Bay and Bundaberg regions to pick up their children from school.
Some schools in Brisbane also contacted parents, asking them to pick up their children.
Ms Palaszczuk said conditions could be volatile across the state's south-east corner for the next 24 to 48 hours.
However, late this afternoon the Bureau of Meteorology said a stable air mass over South-east Queensland, near the surface, meant severe storms were still possible but less likely tomorrow.
Brisbane Mayor Adrian Schrinner today deemed the recent flooding disaster bigger "in many ways" and more widespread than 2011, with some affected suburbs flooding again this morning.
The Mud Army 2.0 was cancelled until at least mid-Saturday, upon the Premier's advice.
BOM forecaster Laura Boekel said the possible storms were different to what was seen earlier in the week.
"This isn't a widespread-area rain, it's severe thunderstorms, and with severe thunderstorms comes severe hazards and phenomena," she said.
"That doesn't just include the heavy rain, it includes the giant potential for giant hail, as well as damaging winds.
Deputy Police Commissioner Shane Chelepy warned anyone who has been flooded in the past few days that they could flood again if there are heavy falls.
Grantham evacuated, Logan River rises again
Meteorologist Kimba Wong said a major storm worked its way to Brisbane via Ipswich from the Lockyer Valley early this morning, bringing heavy rains to the region.
Deputy Commissioner Shane Chelepy said residents in the town of Grantham were evacuated as a precautionary measure.
"We've experienced over 80 millimetres of rainwater in the Grantham catchment this morning. As a result of that, we are taking a precautionary measure to sound the evacuation siren," Mr Chelepy said.
Mr Chelepy warned many homes previously flooded could do so again.
Overnight, Brisbane saw 48mm of rainfall in just 30 minutes and Maroochydore recorded 52mm in the same time frame.
"Just after midnight we saw hail of 5-6 centimetres around Inglewood, so that's incredibly large hail and can do a lot of damage," Ms Boekel said.
"We've also got damaging winds so 93 kilometres [per hour] reported at Dalby Airport and we've had reports of trees down across that area."
A different storm cell brought 56mm of rainfall to Redcliffe, north of Brisbane.
The Sunshine Coast was also hit hard.
Ms Wong said Maroochydore has received 76mm in the past 24 hours.
"Up on the Sunshine Coast we've had some heavy rainfall totals coming through with a couple of rounds of storms, mostly south of Maroochydore down towards Caloundra," she said.
Some Sunshine Coast roads were closed due to downed trees, and traffic lights were affected.
While the BOM did not record overwhelmingly strong winds in the region, Ms Wong said trees that were sodden from days of heavy rainfall and floodwaters were prone to falling more easily.
"Trees are probably more likely to topple over a little bit easier than they would have otherwise. So might not take such strong winds to bring them down," she said.
Flooding 'massively more widespread' than 2011
Brisbane Lord Mayor Adrian Schrinner said every single suburb of the city was affected by flooding, unlike the 2011 flood when it was mostly riverfront suburbs that were hit.
"The difference between this disaster and the 2011 one is very stark, and it's just all of that creek flooding as well as that river flooding," Mr Schrinner told ABC Radio Brisbane.
"The river may not have come up as high, but the destruction is more widespread – massively more widespread."
The Lord Mayor said every suburb in Brisbane was impacted by the recent weather event, whether by river flooding or creek flooding.
Seqwater said there were reduced outflows from Wivenhoe Dam given the forecast for the possibility of more rain.
Almost 1 million megalitres of water has been moved out of the dam already with "steady controlled flows", but 30 per cent of the flood compartment still needs to be emptied.
On the northside, creeks including Enoggera Creek and Kedron Brook suffered severe damage and erosion, with Kedron Brook bikeway completely washed away through Grange and Stafford.
On the southside, Oxley Creek and Norman Creek also rose quickly and caused immense damage.
"There's 190 suburbs in Brisbane and every single one of them was impacted," Mr Schrinner said.
