In the Bothnian Bay ice drifts westward.
In the northern Bay of Bothnia there is 35-60 cm thick fast ice in the archipelago. Farther out 25-45 cm thick, consolidated and in places ridged drift ice, approximately to the line Malören - Oulun portti. Ice pressure occurs in the ice field, which in places is very difficult to force. Farther out 5-20 cm thick very close ice and 20-40 cm thick floes of consolidated brash ice. At the ice edge, which runs approximately along the line Raahe-Luleå, there is a narrow brash ice barrier. Off Raahe, the ice edge runs approximately west of Raahe lighthouse.
In the southern Bay of Bothnia there is 10-30 cm thick fast ice in the archipelago. Off Pietarsaari there is very close thin ice to approximately 10 nautical miles west of Kallan. Further towards the Quark, in places thin very open and open ice.
In the Quark there is in places thin open ice. In the inner archipelago there is 20-40 cm thick fast ice. In the outer archipelago 10-20 cm thick very close ice to Utgrynnan.
In the Sea of Bothnia in the archipelago there is 10-35 cm thick ice and new ice.
In the Archipelago Sea in the inner archipelago, there is 10-25 cm thick fast ice and thin level ice.
In the western Gulf of Finland there is 10-20 cm thick fast ice and thin level ice in the archipelago.
In the eastern Gulf of Finland there is 10-30 cm thick fast ice in the inner archipelago. Farther out thin very open ice approximately to Tiiskeri and Kotka lighthouse. Outside Kotka and Hamina, thin very close ice to west of Rankki. In the Gulf of Vyborg and off St. Petersburg there is 10-30 cm thick very close ice to Motschnyi.
Icebreakers: Otso, Polaris, Sisu and Frej assist in the Bay of Bothnia. Thetis 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, Pietarsaari and 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.
Alterations to the restrictions: Minimum ice class and deadweight required of assisted vessels from 22nd February:
Raahe, IA of more than 2000 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.
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