Winter has begun to make its presence felt in Finland over the past few days, with temperatures plunging and snowfall spreading across the country.
In Lapland, the mercury dropped to around –20C overnight on Saturday. North Ostrobothnia and Kainuu saw roughly 10 centimetres of snow, while scattered snow showers were also reported across southern and central Finland over the weekend.
The Finnish Meteorological Institute (FMI) has issued a traffic weather warning for Sunday covering North Savo, North Karelia, Kainuu and the western parts of North Ostrobothnia. Snow and sleet are expected to create poor driving conditions, slowing traffic and increasing the risk of accidents.
According to the FMI, the exceptionally mild October and early November weather is now giving way to an early winter that is colder than average. Several indicators suggest that the colder period could persist for several weeks — or even a couple of months.
Polar vortex may shift over Finland
Yle meteorologist Matti Huutonen says the phenomenon known as the polar vortex will play a major role in shaping winter conditions.
"The polar vortex is an area of cold air — essentially a deep low-pressure system — that forms over the Arctic during winter," he explained.
Current signals suggest the vortex may be shifting over Finland.
"There are signs that it could bring colder weather for a longer period," Huutonen said.
"But it's not a foolproof forecasting tool — the effects don't always materialise at ground level."
