Welcome to the Baltic Sea Ice Services
In the Bay of Bothnia, a lead covered by very open ice runs along the Swedish coast from about Skellef-teå to Norra Kvarken. At sea, there is mostly 10-40 cm thick, very close and in places ridged ice. In the Sea of Bothnia, the fast ice is followed by thin level ice or by drift ice with varying concentration. In the Gulf of Finland, off the 5-40 cm thick fast ice in the archipelagos, there is 10-30 cm thick, very open to very close ice in the northeastern part. In the southeastern part, mostly open water occurs. In the Gulf of Riga, very close ice occurs in the northern part, and in sheltered bays 10-20 cm, and in places 20- 40 cm thick fast ice can be found.