The category four storm slammed into the coast of Queensland state between Bowen and Airlie Beach yesterday afternoon, packing destructive winds and devastating some of the region's tourist hotspots.
It has since been downgraded to a tropical low but the Bureau of Meteorology still warned of damaging wind gusts with "intense" rain, sparking flooding fears as river levels rise.
"This rainfall is likely to lead to major river flooding over a broad area this week," it said.
Roads to the towns of Bowen, Airlie Beach and Proserpine were inaccessible, with more than 60,000 homes without power and communications down in many areas. But no deaths were reported and only one significant injury -- a man crushed by a collapsing wall.
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Queensland Premier Annastacia Palaszczuk flew by helicopter to Bowen, which bore much of the brunt, and said mass evacuations helped save lives.
Tens of thousands of people moved to higher ground or cyclone shelters or left the region before Cyclone Debbie made landfall.
The premier was due to head to the town of Proserpine where "we expect there to be some more widespread damage".
Dawn broke on scenes of devastation.
Pictures posted on social media showed a light plane flipped upside down, yachts washed ashore, power poles down and trees fallen on houses.
Whitsunday Regional Council mayor Andrew Willcox described cyclone-ravaged Bowen as "like a war zone".
In the mining town of Collinsville, residents said the storm was emotionally draining, with winds raging for hours as they cowered inside.
"I'm shattered emotionally and physically. I've gone through the worst 24 hours I've experienced in my 53 years," a local identified only as Julie told the Australian Broadcasting Corporation.