A number of residents in Logan in southeast Queensland had to be rescued overnight after their homes were cut off or inundated by floodwaters.
A major flood warning is still current for areas of the Logan River, south of Brisbane, where new records have been set from the peaks seen five years ago.
It came as thousands of homeowners begin to assess the scale of damage across the southeast of the state and fears the damage bill from the disaster could top $1 billion.
There were three water rescues overnight, including a woman found floating in floodwater in Jimboomba, Logan, in the early hours of Wednesday.
QFES Deputy Commissioner Mike Wassing said there were 85 requests for assistance, taking the total number of incidents for the crisis so far to 10,200 calls for help and 638 water rescues.
"It's still a very dangerous environment," he told the Nine Network.
"Unfortunately ... the bureau is now predicting the potential for severe storms later on today and through to the weekend."
Emergency crews were checking on the welfare of the residents of Waterford on Wednesday morning after the lower part of the Logan River rose.
The river level at the town is sitting at 10.7 metres, above the 2017 peak of 10.6 metres seen during Cyclone Debbie, after peaking on Tuesday afternoon at 11.15 metres.
"The Logan River at Waterford is expected to continue to ease, however, river levels will remain above the major flood level (9m) for the majority of Wednesday," the Bureau of Meteorology said.
Some 8,000 homes in the Logan area are without power.
Meanwhile, other areas in the state's southeast have started a massive clean-up after the devastating flood event sparked by a 'rain bomb' that has killed nine people and ruined thousands of homes and businesses.
Queensland Police remain concerned for the fate of a man still missing after he fell from a boat into the Brisbane River at the weekend.
The massive clean-up effort will target at least 18,000 homes, prompting Brisbane Lord Mayor Adrian Schrinner to revive the 'Mud Army' that helped the city recover from floods in 2011.
But the BoM continues to warn "severe weather" could return, disrupting the recovery effort.
"We are looking at a return for showers and storms late Wednesday into Thursday and Friday," spokesman Jonathon How said.
"We could see localised heavy falls of 50mm to 100mm each day as well as damaging winds and small to large hail.
"So very much the message to those people in southeast Queensland - the danger isn't over just yet."
Aside from Logan River, the bureau is also monitoring major flooding of the Brisbane, Bremer and Mary Rivers as well as Warrill Creek.
"These rivers are likely to remain quite high for some time so the danger is still very much still there," Mr How said.
"It's clear that the flooding disaster emergency here in the southeast is not over yet, but the recovery process has begun," Deputy Premier Steven Miles said on Wednesday.
"Early estimates suggest that the damage bill for this disaster could be up to a billion dollars."
Elsewhere, health authorities are warning Queenslanders to stay away from floodwaters during the clean-up.
"There's the potential of biochemical contamination, the debris and potentially snakes - people definitely shouldn't be jumping in the water for a swim," epidemiologist Hilary Bambrick told AAP.
Queenslanders have also been warned of a rise in mosquito activity because the standing water creates ideal breeding conditions.
The Port of Brisbane is still closed but most schools are reopening on Wednesday with around 80 to remain shut, down from 550 the day before.
