Rare “Fallstreak” Cloud Sparks Mystery Across Australia

It's not an unknown occurrence that when strange things appear in the sky, onlookers take notice. But this time, the conditions may just be a bit stranger than usual.

Earlier this week Australians caught a glimpse of a bizarre sight in their morning sky, something that's not only rare, but also quite strange to see. Looking like a vortex for clouds, with a looming rainbow trapped in the center, Australians across the continent snapped shots of what they thought was an alien spacecraft, or rather a hole in the atmosphere. Taking to social media, the strange images garnered much attention, but as soon as the mystery was up, the strange solution was found.

Known as a "Fallstreak Hole", the phenomenon occurs when droplets in a cloud supercool below freezing, but without turning to ice-causing a strange structure and uniformity within the water molecules. Much more like a crystal, the cloud is able to create a rainbow that lingers in the sky.

"These 'supercooled' water droplets need a 'reason' to freeze, which usually comes in the form of ice crystals" researchers from the National Oceanic and Atmospheric Administration say. "Planes passing through the cloud layer can bring these ice crystals [to initiate the process]."

"Once the ice crystals are introduced, the water droplets quickly freeze, grow and start to fall. A hole is left behind, which will start to expand outward as neighboring droplets start to freeze."

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