The ice drifts north in the Bay of Bothnia.
In the northern Bay of Bothnia 45-65 cm thick fast ice in the archipelago. Off the fast ice first to Bothnia Buoy 10-20 cm thick close and very close ice, then 20-50 cm thick, in places heavily ridged, very close ice. There are leads and cracks in the ice field.
In the southern Bay of Bothnia 20-40 cm thick fast ice in the archipelago. Farther out 20-40 cm thick ridged big floes, and then 10-30 cm thick close and very close ice. There are cracks and large openings in the ice field.
In the Quark very open ice. In the Vaasa archipelago first 25-40 cm thick fast ice to west of Ensten. Farther out there is some drifting heavy floes.
In the Sea of Bothnia 10-30 cm thick fast ice in the archipelago. Off the fast ice some drifting heavy floes.
In the Archipelago Sea and in the western Gulf of Finland rotten fast ice in the inner archipelago. Along the fairways open water.
In the eastern Gulf of Finland 10-30 cm thick rotting fast ice in the inner archipelago. Off Hamina there are few floes broken off the fast ice. Elsewhere along the fairways and in the outer archipelago open water.
Icebreakers: Otso, Kontio, Polaris, Urho and Sisu assist in the Bay of Bothnia. Thetis and Zeus assists in the Quark.
Assistance restrictions: 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, IC of more than 2000 tons.
Kaskinen, II of more than 2000 tons.
Kristiinankaupunki, Pori, Rauma, Uusikaupunki, Taalintehdas, Förby, Kantvik and Hamina, II of more than 2000 tons.
Vessels bound for Gulf of Bothnia ports in which assistance restrictions apply shall, when passing the latitude 60N, 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 10 492 7600.
Vessels bound for ports in the Bay of Bothnia shall report to Bothnia VTS 20 nautical miles before Nordvalen lighthouse on VHF channel 67.
The traffic separation scheme in the Quark is temporarily out of use.
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