Welcome to the Baltic Sea Ice Services
In the archipelagos of the Bay of Bothnia, there is in the north up to 65 cm and in the south 20-40 cm thick fast ice. At sea, 10-50 cm thick, very close and locally ridged ice occurs in the eastern part followed by a belt of open to close ice and by very open ice further west towards the Swedish coast. In Norra Kvarken, there is 20-40 cm thick fast ice in the archipelagos of both coast followed by very close and partly ridged ice. At sea, mostly very open ice can be found. In the Sea of Bothnia, there is fast ice in the archipelagos, followed by open water. In the easternmost Gulf of Finland, off the 15-45 cm thick fast ice in the archipel-agos, there is mostly 20-30 cm thick very close ice. Furthermore, rotten ice is present in the Archipelago Sea and Åland Sea, in the Pärnu Bay, Vainamieri and in the lake Mälaren.