Photojournalist Kaylyn Messer discovered on Facebook that there was a rare, naturally-occurring ice circle on the Middle Fork Snoqualmie River near North Bend, Washington, which is close to her house. She decided to check it out, and all nature lovers are glad she did. Her videos offer a glimpse of a phenomenon most will never see in person.
Messner told This Is Colossal, “The ice circle was pretty captivating. You can hear the sound of the river flowing continuously. Sounds from the ice periodically interjected with very small sharp cracks and groans. Overall, it was a quiet experience to stand along the river watching the ice circle rotate.”
An ice circle is thought to happen in river bends or eddies. They occur in colder climates, like Scandinavia or North America, but have been seen in England and Wales. Some of the largest recorded discs were some 50 feet in diameter.
According to an article in a journal of the American Physics Society, the ice circles spin because they are melting. IFLScience writes that as the circle melts, “the water beneath the ice spirals slightly horizontally as it plumes downwards, much like when water drains down a sinkhole and sweeps around in a spiraling rotation.”
As the warmer water spins the chunk of ice, it bumps into surrounding ice and is slowly shaved into a circle.
Smaller ice circles are called ice pans, which are typically about a foot in diameter. In the River Llugwy at Betws-y-coed, North Wales, a set of them were seen in 2008.