Pancake ice formed on Lake Superior as temperatures in Wisconsin dropped on November 30. Video filmed by local photographer Cheryl Koval shows the disc-shaped ice formations floating on top of the ...

A photographer captured pancake ice covering the frigid waters of Lake Superior in Ashland, Wisconsin, on Nov. 30. It forms when strong waves don't allow the surface to freeze into a sheet of ice.

The phenomenon, known as an ice pancake, was seen at the River Dee near Braemar - where temperatures dropped to -10.5C (13F) earlier this week. They are not thought to be a common sight in Scotland.

Floating discs of frozen foam known as "ice pancakes" have been spotted on a North Yorkshire river. Pictures of the unique spectacle on the River Swale in Richmond were captured by retired soldier ...

Pancake ice formed on Lake Superior as temperatures in Wisconsin dropped on November 30. Video filmed by local photographer Cheryl Koval shows the disc-shaped ice formations floating on top of the ...

Foam generated by the falls at Norby Weir, near Thirsk, has frozen to form circular discs known as "ice pancakes". They are created when surface foam freezes and the edges are rubbed off by ...

A rare natural phenomenon has been spotted on a river during the current cold snap. Foam generated by the falls at Norby Weir, near Thirsk, has frozen to form circular discs known as "ice pancakes".