FMI Sea Ice Outlook for the Baltic Sea

baltic sea ice and water temperature 31 March 2021

  • The ice field in the central Bay of Bothnia is ridged and the ice is 20 to 60 cm thick. The fast-ice thickness varies from 30 to 65 cm.
  • In the Vaasa archipelago, the ice is 20-45 cm thick. In the Quark there is open water.
  • In the Sea of Bothnia the ice has started to rot.
  • In the Turku archipelago, the ice has almost melted away; off-shore water temperatures are above 1°C.
  • In the Northern Baltic Proper, water temperatures are above 2°C.
  • In the western part of the Gulf of Finland, the coastal ice is rotten; off-shore water temperatures are above 2°C.
  • In the eastern Gulf of Finland the coastal fast ice is 20–45 cm thick. In the central basin there is rotting drift ice, 10-30 cm thick.
baltic sea ice and water temperature 30 April 2021

  • The ice field in the central Bay of Bothnia is ridged and the ice is 15 to 50 cm thick. The fast-ice thickness varies from 30 to 60 cm and signs of rotting are starting to appear. In the Southern Bay of Bothnia the costal ice is rotten. Farther south the ice has disappeared.
Next update to the forecast is being issued in November 2021.


Contact: Finnish Meteorological Institute, Ice Service
iceservice@fmi.fi
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