See SVT's meteorologist Tora Tomasdottir explain the phenomenon in the clip above.
The phenomenon of plate ice: "Looks almost like someone turned"
2020-10-24T17:47:52.017Z
Ice lying on the water as round plates and spinning. A phenomenon that occurs when ice forms on moving water. - It almost looks like someone has turned and started to get some edges up, says meteorologist Tora Tomasdottir.
Source: svt