Brisbane is "unlikely" to see destructive winds with Cyclone Alfred forecast to weaken to a category one system as it moves across Moreton Bay islands on Saturday morning.

More than 330,000 homes remain without power across south-east Queensland as Ex-Tropical Cyclone Alfred moves inland.

South East Queensland and northern NSW are in it for the long haul with ex-Tropical Cyclone Alfred, forecasters have warned, with severe weather and flood warnings still in place for large parts of the east coast.

Residents in Queensland's south-east has been warned of life-threatening flooding that will be caused by intense rain before and after Tropical Cyclone Alfred's landfall.

Alfred is forecast to make landfall near Brisbane, the capital of Queensland and Australia’s third largest city.

Tropical Cyclone Alfred has slowed its approach and is now expected to cross the south-east Queensland coast on Friday afternoon.

The Bureau of Meteorology has been accused of failing to warn Hervey Bay of severe storms that dumped more than 300mm of rain on the coastal community, causing flash flooding and a string of swiftwater rescues.

Residents in Cyclone Alfred’s danger zone have been warned they only have hours to escape, while there are fears an entire coastal city in northern NSW will be inundated with water.

The exact trajectory of Tropical Cyclone Alfred shifted overnight from a crossing north of Brisbane down to the city’s southern suburbs, with the Bureau of Meteorology issuing a warning area from Double Island Point, south of K’Gari (Fraser Island) to north of Grafton in NSW.

Tropical Cyclone Alfred is located 560 km east of Brisbane and the Sunshine Coast and gale force winds are expected to develop over the next 24 to 48 hours along widespread moderate to major flooding say the Bureau of Meteorology.

Australia’s east coast is bracing for tidal surges, intense rainfall, strong winds and flooding as a cyclone is expected to veer toward the country’s third-biggest city.

Authorities are telling residents to prepare now for wet, windy and wild weather — including potential flash flooding — from Wednesday till the weekend.