Simplified ice chart and reference charts

Normal situation Previous ice map Ice map of the previous year Icebreakers

Previous ice map


In the Bay of Bothnia the ice is moving to northeast and some new ice has formed.

In the northern Bay of Bothnia there is thin fast ice in the inner archipelago. There is a narrow area of compact ice at the fast ice edge and ice formation farther out.

In the northern Lake Saimaa there is new ice and ice-formation.

Icebreakers: Meteor assists in the northern Lake Saimaa.

Restrictions to navigation: Minimum ice class and deadweight required of assisted vessels from 16th December:
Siilinjärvi, Puhos and Joensuu, I and II of more than 2000 tons.
From 19th December:
Tornio and Kemi, I and II of more than 2000 tons.
From 20th December:
Oulu, I and II of more than 2000 tons.

About the charts

The ice chart of the whole Baltic Sea (pdf) is published in the autumn twice a week (Monday and Thursday) and daily when the amount of ice increases until until ice break-up in spring. It represents current ice situation, ice breaker positions and traffic restrictions in the Baltic Sea.

The simplified charts are updated once a week at the latest on Tuesday morning. The first one represents measured level ice thicknesses, ice coverage and sea surface temperature. The reference charts represent average, 1965 – 1986, ice situation on that day (= normaali), last week´s situation, last year´s situation and the positions of the ice breakers.

Explanation of chart's finnish words

  • jäätä: ice
  • haurasta: rotten ice


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