Welcome to the Baltic Sea Ice Services
The northern archipelagos are covered with 30-55 cm thick fast ice. Outside the fast ice there is east of Malören a lead, covered by thin ice. This is followed by very close 15-40 cm thick ice, open ice, new ice and open water approximatelly to the line Farstugrunden - 15 nm southwest of Kemi 1 - Raahe. The ice is partly rafted and ridged and difficult to force. In the southern archipelago there is in places 10-35 cm thick fast ice, and some new ice is present along the coasts. In the inner archipelago of Norra Kvarken there is rotten fast ice. Thin level ice occurs in the skerries of the Sea of Bothnia. On the northern Ångermanälv there is open, up to 20 cm thick ice.
In the Gulf of Finland there is fast ice, which gets rotten, in the eastern archipelago of the Finnish coast. The Vyborg Bay and Bjerkesund are covered with 10-30 cm thick rotten ice. Otherwise, 5-20 cm thick ice of variing concentration occurs up to about the line Hamina – Šepelevskij.