Welcome to the Baltic Sea Ice Services
In the archipelagos of the Bay of Bothnia, there is fast ice, in the north up to 80 cm, in the south 20-45 cm thick and in Norra Kvarken the fast ice thickness is 20-40 cm. The fast ice is rotting and melting. At the Finnish coast, 20-80 cm thick very close ice follows the fast ice. At sea, there is a 5-15 nm wide belt with 10-50 cm thick, open to very close, partly ridged ice in the central and in the southern Bay of Bothnia. Further south, open water occurs in the northern archipelagos of the Sea of Bothnia.