The conditions for the creation of an ice wall on the lake occur about once a decade, when the ice is thick enough and there are large variations in the daily temperatures. As the ice melts, it creates a chasm, but when it freezes again and expands, it forces the edge of the chasm upwards, creating the 'wall' effect.

The Central Finland town of Jyväskylä has had a sum total of 4.5 hours of sunshine so far in November.

The Finnish Meteorological Institute has issued a warning of very cold temperatures from Monday afternoon to Wednesday morning, February 26 to 28.