A uncommon assortment of “ice eggs” has been noticed in Finland, a phenomenon consultants say solely happens in extremely specific situations.
Risto Mattila, who photographed the eggs, mentioned he and his spouse had been strolling alongside Marjaniemi seashore on Hailuoto island on Sunday once they got here throughout the icy balls protecting a 30-metre (98ft) expanse of shoreline.
“The largest of the eggs was concerning the dimension of a soccer,” mentioned Mattila, an novice photographer. “It was an incredible view. I’ve by no means seen this phenomenon earlier than.”
Jouni Vainio, an ice specialist on the Finnish Meteorological Institute, mentioned the incidence was not frequent, however may occur about yearly in the suitable climate situations.
“You want the suitable air temperature (under zero, however solely a bit), the suitable water temperature (close to freezing level), a shallow and gently sloping sandy seashore and calm waves, possibly a light-weight swell,” he mentioned.
“You additionally want one thing that acts because the core. The core begins to gather ice round it and the swell strikes it alongside the seashore, ahead and again. A small ball floor will get moist, freezes and turns into larger and greater.”
Autumn is the right time to see the phenomenon, in response to Dr James Carter, emeritus professor of geography-geology at Illinois State College, as that is when ice begins to type on the floor of water, making a type of slush when moved by waves.
“I can image the backwards and forwards movement of the floor shaping the slushy combine,” he mentioned. “Due to the photographer who shared the images and observations, now the world will get to see one thing most of us would by no means have the ability to see.”