Simplified ice chart and reference charts

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

Previous ice map


In the Quark the ice drifts slowly north-northeast.

In the northern Bay of Bothnia there is 40-75 cm thick fast ice in the archipelago. At the fast ice edge 30-50 cm thick ridged consolidated ice to southwest of Kemi 2 and to Oulu 1, following a lead to Kemi 1, Oulun Portti and Merikallat. Farther out 25-50 cm thick rafted and ridged ice. There are cracks and small leads in the ice field.

In the southern Bay of Bothnia 30-55 cm thick fast ice in the archipelago. Off the fast ice edge there is a ridged ice zone, difficult to force. Farther out 20-50 cm thick mainly very close ridged ice. There are cracks and small leads in the ice field.

North of the Quark there is 20-40 cm thick mainly very close ice. In the Quark 10-30 cm thick open ice including some thicker floes. Southwest of Nordvalen there is open water. In the Vaasa archipelago 30–55 cm thick rotting fast ice to Ensten. Further on, approximately to Norra Gloppsten, 20-35 cm thick level ice. The fairway is mainly open. In the vicinity of Vaasa lighthouse there are vast 20-35 cm thick ice floes.

In the Sea of Bothnia rotten fast ice in the archipelago. Farther out ice free.

In the Archipelago Sea in places rotten fast ice in the inner archipelago, otherwise ice free.

Western Gulf of Finland is ice free.

In the eastern Gulf of Finland in places rotten fast ice in the inner archipelago. Farther out open water. East of the line Halli - Seskar 10-30 cm thick drift ice.

Icebreakers: Kontio, Otso, Polaris, Urho and Sisu assist in the Bay of Bothnia. Zeus assists in the Quark.

Restrictions to navigation: Minimum ice class and deadweight required of assisted vessels:
Tornio, Kemi, Oulu, Raahe, Kalajoki, Kokkola and Pietarsaari, IA of more than 4000 tons.
Vaasa, IA of more than 2000 tons.

Vessels bound for Gulf of Bothnia ports in which traffic restrictions apply shall, when passing the latitude 60°00'N, report their nationality, name, port of destination, ETA and speed to ICE INFO on VHF channel 78. This report can also be given directly by phone +46 31 699 100.

Vessels bound for ports in the Bay of Bothnia shall report to Bothnia VTS on VHF channel 67 20 NM before Nordvalen lighthouse.

The traffic separation scheme in the Quark is temporarily out of use.

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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