'Monster' cyclone Debbie batters northeast Australia

Ayr: A "monster" cyclone made landfall in northeast Australia on Tuesday, cutting power and uprooting trees as coastal towns went into lockdown in the face of lashing rain and howling winds.

Great Barrier Reef islands popular with foreign tourists were pummeled by the category four storm which hit the Queensland state coast with destructive wind gusts of up to 270 kph near its wide core.

There were fears the tempest's arrival would coincide with early morning high tides, causing severe flooding, but its progress slowed before it crossed the coastline between the towns of Bowen and Airlie Beach.

The full force of the cyclone was already being felt in popular tourist destinations.

"It felt like we were underneath a freight train for most of the night, strong base rumbles as the... Wind rattled past and made the buildings shake," Cameron Berkman, who is holidaying on Hayman Island, told the Australian Broadcasting Corporation.

Queensland politician Mark Ryan said it was also chaotic at Airlie Beach, the mainland holiday gateway to the Whitsundays.

"Trees down in Airlie Beach and reports of windows shattering and some roofs starting to cave in," he tweeted.

The Bureau of Meteorology, which forecast up to 500 millimetres (50 cm) of rain, said people should stay calm and not be complacent as the eye of the storm passes.

"Do not venture outside if you find yourself in the eye of the cyclone -- very destructive winds from a different direction could resume at any time," it said.

"People in the path of the very dangerous cyclone should stay calm and remain in a secure shelter."

Queensland Premier Annastacia Palaszczuk, who warned the storm was shaping up as a "monster" and would last for hours, said more than 30,000 homes were already without power.

Queensland Police Commissioner Ian Stewart said Debbie's slow pace was having "a battering ram effect".

"These winds are going to keep pounding, pounding, pounding," he said. "I suspect before the day is out, we will see a lot of structural damage in the cyclone's path."

Residents across the area, who have sandbagged and boarded up homes, have been told to prepare for the worst weather to pummel the state since Cyclone Yasi in 2011, which ripped houses from their foundations and devastated crops.

The federal government is on standby to provide immediate assistance in the aftermath, with a disaster relief ship en route from Sydney and navy helicopters and planes on standby.