Simplified ice chart and reference charts

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

Normal situation

FINNISH ICE REPORT 23.03.2017

The ice in the Bay of Bothnia and Gulf of Finland is moving eastward.

In the northern Bay of Bothnia there is 45-70 cm thick fast ice in the archipelago. Farther out there is 20-40 cm thick very close ice and 30-60 cm thick ridged compact ice. The icefield is difficult to force and there is occasionally ice pressure. Farther south 15-40 thick very close ice mixed with thick floes of consolidated brash ice. There are cracks in the ice fields.

In the southern Bay of Bothnia there is 20-40 cm thick fast ice in the archipelago. Off the fast ice there is first a narrow lead and then alternately thin level ice and 20-40 cm thick ridged close ice approximately to the latitude of Kalajoki. Further on to the Quark, very open and thin drift ice. In places there are areas of large thick floes.

In the Quark there is 20-40 cm thick fast ice in the inner archipelago and close ice to Ensten. Farther out open water.

In the Sea of Bothnia in the archipelago there is 10-40 cm thick fast ice. Off the fast ice there is, in places, thin drift ice.

In the Archipelago Sea there is 10-30 cm thick rotting fast ice and thin level ice in the inner archipelago. In the fairways there is mainly open water.

In the western Gulf of Finland there is 10-25 cm thick rotting fast ice and thin level ice in the archipelago.

In the eastern Gulf of Finland there is 15-35 cm thick fast ice in the inner archipelago. Off Kotka and Hamina outside the fast ice there is 10-25 cm thick very close ice. East of line Rankki - Schepelevski there is 10-30 cm thick very close ice.

Icebreakers: Kontio, Sisu and Frej assist in the northern Bay of Bothnia. Otso assists in the southern Bay of Bothnia. Voima assists in the eastern Gulf of Finland.

Restrictions to navigation: Minimum ice class and deadweight required of assisted vessels:
Tornio, Kemi and Oulu, IA of more than 4000 tons.
Raahe, Kalajoki, Kokkola and Pietarsaari, IA of more than 2000 tons.
Vaasa, IA and IB of more than 2000 tons.
Kaskinen, I and II of more than 2000 tons.
Loviisa, Kotka and Hamina, IA and IB of more than 2000 tons and IC and II of more than 3000 tons.

The traffic separation scheme in the Quark is temporarily out of use due to ice conditions from 18th February.

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.

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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