The sale of fishing permits has been suspended for two sites where water temperatures have risen to critically high levels, especially for salmon.

One spark was all it took. The driver of the forest harvester was working a logging site at Renko in Kanta-Häme. The grapple of the machine hit a stone, throwing a spark that set the underbrush ablaze.

Finland is experiencing warm and sunny weather with temperatures ranging between 20 and 25 degrees Celsius, and an advisory for strong ultraviolet radiation has been issued for the south and southwest.

The last time Finland had this much sunshine in March was nearly a decade ago, in 2013. High pressure typically brings clear skies, and this was also the case last month in Finland.

Finland’s worst wildfire in more than half a century scorched the country’s northwest for a fifth day on Friday, tearing through forests left dry by record summer heat.

An extended period of hot, dry weather is affecting the harvest outlook and impacting grain growth. Even the wild berry season, which was off to a good start, may be in peril.

Strong winds have created a picturesque wall of ice on the shore of Lake Pyhäjärv. "This often happens at this time of year on the shores of larger lakes and on the sea shore," Huutonen said, adding that there were gale force winds in the area over the weekend.

Finland is emerging from a deep freeze, giving way to milder temperatures and more snow. On Saturday three people in Helsinki fell through the ice at two different locations within the same 15-minute period.

A high of 14.7 degrees Celsius was measured in the southwestern city of Pori on Monday night.

An exceptionally warm air current from the southeast has kept days and nights unseasonably mild in southern and central Finland since last week. Meanwhile the north of the country has been shivering with rain and temperatures in the single digits. The highest reading in decades was recorded in Kokemäki, southwest Finland.

The cherry blossoms along the Aura riverbank are a huge draw for tourists and photo enthusiasts every year around mid-May. The city's head gardener said he was amazed by the sight of the flowers budding this time of year.

According to Simo Laine, head horticulturalist at botanical garden in Turku, southwest Finland, it could well be the first time that the blooms have made an appearance in the country as early as January.

More than 40,000 households faced blackouts overnight.

The incidence of ticks at all of Turku University’s research sites in Turku as well as in Helsinki has risen over the past 20 years, and they can still active into the fall, even after periods of freezing weather. Southwestern Finland and Uusimaa have reported 29 cases of tick-borne encephalitis and some 1,500 people have contracted Lyme disease, an illness caused by ticks carrying Borrelia burgdorferi.

A total of 140 crashes and other accidents involving elk have been reported in the last week alone, police said, especially in the area around Pyhäjärvi lake near the town of Säkylä in the southwest of Finland.

Researcher Sirpa Lehtinen from the Finnish Environment Institute (Syke) said that cyanobacteria exist in seawater all year round, but intense heat causes them to multiply quickly.

A close cousin to the tornado - the waterspout - touched down in south-western Finland on Friday.

After several warm days, lightning bolts struck Finland about 16,000 times on Saturday. By evening, nearly 20,000 customers were without electricity. More trees may be felled as electrical storms move toward the Russian border.

A fire chief in the south-west said firefighters were called to several fires a day in recent days, saying that all were caused by people who ignored warnings.

Spring blossoms, dusty streets, distant fires and a lack of rain combine to create hazardous respiratory conditions.