Tropical Cyclone Marcia was upgraded with gusts of 285 kilometres per hour, Australia's Bureau of Meteorology said, with the storm expected to slam into the Queensland coast this morning.
Further north, Tropical Cyclone Lam also intensified to a category four storm as it made landfall near the sparsely populated Northern Territory Aboriginal communities of Milingimbi and Gapuwiyak early today with wind gusts of 250 kilometres an hour.
Meteorologists described both storms as having a "very destructive" core.
Massive seas, a deluge of rain, flash flooding and gusts of up to 295 kilometres per hour are forecast along with abnormally high tides when Marcia hits somewhere between the towns of Mackay and Gladstone.
"This is a serious event. It has changed drastically since this morning," said Queensland Premier Annastacia Palaszczuk yesterday.
"Queenslanders need to be prepared now. This is an important time now not to panic but to make sure you have your preparations in place."
Palaszczuk said all Queensland hospitals had activated their emergency plans and additional ambulance services had been moved to some areas.
In Yeppoon, supermarket shelves were emptied and sandbags filled as locals readied for a long night.
"It's the unknown that's the worry," Deeann Busby told the Brisbane Courier Mail newspaper as she taped up windows in her homewares shop and cafe.
"We've had so many close calls over the years that we've probably gotten a bit complacent - but this one's looking a bit more serious."
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