Meteorologists say the tropical low is still packing a punch in parts of south-east Queensland and northern NSW ahead of the new working week.

One man died in floodwaters, the authorities said, and over 330,000 customers were without power in South East Queensland.

Significant damage and power outages are possible in the densely populated region of Queensland, where tropical cyclones impacts are not uncommon but direct landfalls are.

Hundreds of thousands of people in Australia's Queensland state were without power on Sunday after Alfred, a downgraded tropical cyclone, brought damaging winds and heavy rains, sparking flood warnings.

Tropical Cyclone Alfred was 65 kilometres north northeast of Brisbane and 45 kilometres south southeast of Maroochydore at 6am this morning.

Tropical Cyclone Alfred weakened into a tropical low Saturday as it neared Brisbane, Australia, bringing heavy rain and flooding risks to the region, according to officials. Initially expected to make landfall as the first cyclone to strike southeast Queensland since 1974, Alfred's winds dropped to under 39 mph (63 kph) as it shifted inland.

Initially called Cyclone Alfred, the weather front was downgraded to a tropical low with winds set to reach up to 85km/h, less strong than first forecast. The Bureau of Meteorology said the storm is currently sitting off Bribie Island and is moving slowly north,

Hundreds of thousands of people in Australia's Queensland state were without power on Sunday after Alfred, a downgraded tropical cyclone, brought damaging winds and heavy rains, sparking flood warnings.

A rare tropical cyclone weakened to a tropical low weather system on Saturday as it approached Brisbane, the country's third most populous city. Before being downgraded, Cyclone Alfred had been expected to become the first cyclone to cross the east Australian coast since 1974.