One person is dead and others have needed rescuing from the roof of a car as a powerful offshore weather system batters Australia's east coast.
The man's body was found by police on Friday morning near Sandy Creek at Nanango, about two and a half hours northwest of Brisbane.
"We're working to formally identify who this person is," Inspector Scott Stahlhut said.
"We currently have officers from the dive squad who are en route to Nanango to assist with our inquiries."
The death follows the rescue of a number of people "in quite a dangerous situation" on the roof of a car at nearby Kingaroy, Inspector Stahlhut said.
An evacuation site has been set up at the local cultural centre and people have been moved from a low lying caravan park.
Flash flooding is affecting the South Burnett region and drivers are being urged to stay off roads.
Rainfall totals of more than 100mm have been reported in the Sunshine Coast hinterland, with the town of Maleny among the hardest hit.
Damaging winds averaging around 50km/h are possible in exposed parts of the coast and peak gusts may reach 110km/h on Fraser Island, also known as K'gari, forecasters say.
A minor flood warning is in place for the Stanley River at Woodford, about an hour north of Brisbane.
The low-pressure system is expected to move south on Friday and Saturday, and beaches have been closed on the Gold Coast due to the dangerous conditions.
Across the border, wild weather has hit the NSW Northern Rivers district, with the Bureau of Meteorology issuing a severe warning for damaging surf north of Yamba on Friday night.
Waves of more than five metres are possible before conditions begin easing on Saturday afternoon.
"Beach conditions in these areas could be dangerous and people should stay well away from the surf and surf exposed areas," the bureau said.
In Byron Bay, where thousands of music fans have gathered for the Splendour in the Grass festival, campers have faced long queues to access muddy fields.
Festival-goers have reportedly waited 12 hours to enter the site as heavy rain hit, with some forced to sleep in vehicles.
"Due to ongoing weather conditions we can no longer accept any campers or vehicles including day parking at North Byron Parklands," a message on the festival's Facebook page said on Friday.
"We thank you for your patience here and big shout out to our staff who are working around Mother Nature to get you in here safely. Please be kind and patient."
