Welcome to the Baltic Sea Ice Services
In the Bay of Bothnia, the 20-50cm thick, very close, locally ridged ice at sea is drifting towards the east, slowly closing the lead on the Finnish side, while leads are opening in the west. Norra Kvarken is covered by close to very close ice in the east and north and very open ice in the south. In the Sea of Bothnia, there is fast ice and thin level ice in the archipelagos and in sheltered bays, followed by very open ice in the north and open water in the south. In the eastern Gulf of Finland, off the 15-45 cm thick fast ice in the archipelagos, there is mostly 20-30 cm thick very close ice in the northeast and open water in the southeast. Rotten ice is present in the Archipelago and Åland Sea, Pärnu bay, Vainamieri and the Mälaren.