FMI Sea Ice Outlook for the Baltic Sea

FMI Forecast Chart 1 - November

 
  • Ice formation has started in sheltered parts of the northernmost Bay of Bothnia.
  • The water temperature in the central Bay of Bothnia is over 3°C.
  • Over 3°C water temperatures along coasts of Sea of Bothnia, offshore mostly over 6°C.
  • In the Northern Baltic Proper, water temperature over 7°C.
  • In the Gulf of Finland water temperatures are in the range 1°–7°C.
 
 
FMI Forecast Chart 2 - December

 
  • Along the coasts of Bay of Bothnia and off-shore in northern part, 5–25 cm thick ice and thin new ice.
  • 5-10 cm thick ice in the easternmost parts of the Gulf of Finland, otherwise new-ice formation in the archipelago of the eastern Gulf of Finland.
  • The water temperature in the central Bay of Bothnia is over 1°C.
  • The water temperature in the central Sea of Bothnia is over 3°C.
  • In the Northern Baltic Proper, water temperatures are over 5°C.
  • In the Gulf of Finland water temperatures are in the range 1°–5°C.
 
 
FMI Forecast Chart 3 - January

 
  • The Bay of Bothnia is still not frozen over. There is ice along all the shores of the Northern Baltic Sea.
  • In northern Bay of Bothnia, 20–50 cm thick ice. In central parts 5–30 cm thick ice.
  • In the archipelagos of the southern Bay of Bothnia and the Quark, 10–30 cm thick ice.
  • In the central Quark, thin ice.
  • Along the coasts of the Sea of Bothnia, 5–25 cm thick ice.
  • Thin ice in the sheltered archipelago of the western Gulf of Finland.
  • In the central Sea of Bothnia and central parts of the western Gulf of Finland, water temperatures are in the range 1°–3°C.
  • In the Northern Baltic Proper, the water temperature is over 3°C.
  • In the eastern Gulf of Finland, 5–30 cm thick fast ice, and thin ice in central parts.
 
 
Next update to the forecast will be issued in January 2022.
Contact: Finnish Meteorological Institute, Ice Service iceservice@fmi.fi FMI Logo