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 very close 15-35 cm thick ice to the line Estersön – 5 nm south of Kemi 1 – Oulun portti – Tauvo. The ice is rafted and ridged; an about 10 nm wide jammed ice barrier, difficult to force, stretches at its edge. Farther out there is open water. In the southern archipelago there is 10-30 cm thick fast ice, and mostly open water is present outside. In the inner archipelago of Norra Kvarken there is 10-35 cm thick fast ice, farther out mostly open water occurs. Thin level ice is present in the skerries of the Sea of Bothnia. Ångermanälv is covered with up to 20 cm thick fast ice.
In the Gulf of Finland, 10-30 cm thick fast ice occurs in the eastern archipelago of the Finnish coast. The Kronstadt Bay, Vyborg Bay and Bjerkesund are covered with 10-35 cm thick fast ce. Otherwise, open 5-20 cm thick ice occurs up to about the line Bol’šoj Fiskar – Šepelevskij.
In the Gulf of Riga 10-20 cm thick fast ice or thin ice occurs in the Pärnu Bay and in sheltered bays of Moonsund.
In the western part of the Lake Mälaren there is 5-15 cm thick level ice, which gets rotten.