Every so often, the sky produces something that looks like a rendering error.
Each spring, in one of the most remote corners of Australia, morning arrives with a cloud that shouldn’t exist.
It’s a single, impossibly smooth tube of white, rolling across the horizon like a wave that forgot to bring the ocean along with it.
It’s called the Morning Glory, and it may be the most spectacular cloud on Earth.
A Wave in the Sky
The Morning Glory is a roll cloud, but calling it that is like calling the Grand Canyon a ditch. It can stretch up to 1,000 kilometers long, stand one to two kilometers tall, and barrel forward at 60 km/h, sometimes skimming just a few hundred meters above the ground.
Some mornings there’s one; on the best mornings, up to ten parallel rolls march across the sky in formation. Almost like corduroy for giants?
Meteorologists classify it as a soliton, a solitary wave that travels without changing shape or losing speed.
The same mathematics describes tsunamis. Scientists have called Morning Glories “the biggest waves on the planet.” They just happen to move through air instead of water.
The cloud is continuously being born and dying at once: moist air rises up its leading face and condenses, while the trailing edge evaporates away. The result is a cloud that visibly rolls, churning backward around its own axis as it advances.
Why Only Here?
Similar roll clouds have appeared fleetingly over the English Channel, Nova Scotia, and the Gulf of California. But there is exactly one place on Earth where this cloud can be predicted: the southern Gulf of Carpentaria, in far northern Queensland.
The recipe is an accident of geography. Cape York Peninsula is wide enough that sea breezes blow in from both coasts during the day, colliding over its spine and heaving up a mass of humid air.
At night, that air collapses westward over the gulf, sliding beneath a layer of temperature inversion, and the collision sends enormous rolling cylinders of air coasting along the underside of the sky, like ripples under a silk sheet. At dawn, moisture makes the wave visible. By mid-morning, the day’s heat erases it.
The locals in Burketown, population roughly 200, self-declared capital of the Morning Glory, have their own forecast method: when the fridges frost over and the corners of the café tables at the pub curl upward, the air is humid enough.
The cloud is coming.
The People Who Surf It
In 1989, glider pilots Russell White and Rob Thompson did something magnificent and slightly unhinged: they towed into the dawn sky and rode the Morning Glory like a surfer rides a swell. The rising air on the cloud’s leading face is so strong and so smooth that a glider can switch off all thought of altitude and simply carve. Sweeping along the face of a wave two kilometers tall, engine silent, sky turning gold.
Every spring since, a small pilgrimage of pilots has descended on Burketown’s dusty airstrip. In 2009, hang-gliding champion Jonny Durand famously surfed the cloud for a 68-kilometer ride lasting nearly two hours, looping and diving along its face for the Red Bull Glory Glide film project, the closest humans have come to literally surfing the sky.
Seeing It Yourself
The season runs late September through early November, and Burketown is the place. Though even there, only a handful of picture-perfect clouds form each spring. The best views are from the air, which is why the town’s tiny airstrip fills with light aircraft and gliders every October.
Or simply set an alarm, face the Gulf at dawn, and wait for the horizon to start rolling.
The world is full of phenomena hiding in plain sight.
For more, see our 40 Hidden Wonders of the Natural World, Places That Only Exist at a Certain Time of Day, and the dreamlike dunes of Brazil’s ‘Bedsheets’ of Maranhão.
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