The ice drifts rapidly northward.
In the northern Bay of Bothnia there is 40-70 cm thick fast ice in the archipelago. At the fast ice edge there is 30-50 cm thick ridged consolidated ice to southwest of Kemi 1 and to Oulu 1. Farther out a 10-20 nautical miles wide area with thinner ice from Nygrån to northwest of Raahe. Farther south 20-50 cm thick rafted and ridged ice.
In the southern Bay of Bothnia 30-50 cm thick fast ice in the archipelago. Off the ice edge there is ridged ice zone, very difficult to force. Farther out 30-50 cm thick ridged very close ice. Ice pressure occurs in the ice field.
In the Quark , north of Nordvalen, 20-50 cm thick ridged very close ice. From Nordvalen to Gunvorsgrund and southward first 30-50 cm thick and later 10-30 cm thick very close ice. In the Vaasa archipelago 30–50 cm thick fast ice to Ensten. Further to Norrskär 15-30 cm thick level ice.
In the northern Sea of Bothnia 20-45 cm thick fast ice in the archipelago. Off the fast ice edge there is a 5-10 nautical miles wide zone with drift ice with varying concentration. Farther out open water.
In the southern Sea of Bothnia 15-35 cm thick fast ice in the archipelago. Farther out open water.
In the Sea of Åland open water.
In the Archipelago Sea 10-35 cm thick fast ice in the inner archipelago. In the outer archipelago 10-25 cm thick level ice to Utö. Farther south thin drift ice with varying concentration to Suomen Leijona.
In the western Gulf of Finland 15-40 cm thick fast ice in the archipelago. Off the fast ice edge first new ice and thin drift ice with varying concentration along the center line of the gulf. Farther south open water.
In the eastern Gulf of Finland 20-45 cm thick fast ice in the archipelago. Farther out 5-30 cm thick drift ice with varying concentration east of line Rönnskär - Mohni.
Icebreakers: Kontio, Polaris and Urho assist in the northern Bay of Bothnia. Otso, Fennica and Sisu assist in the southern Bay of Bothnia. Zeus assists in the Quark. Voima and Nordica assist in the 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, and minimum cargo of 2000 tons per port.
Raahe, Kalajoki, Kokkola and Pietarsaari, IA of more than 4000 tons.
Vaasa, IA of more than 2000 tons.
Kaskinen, IA or IB of more than 2000 tons.
Kristiinankaupunki, Pori, Rauma and Uusikaupunki, IA or IB of more than 2000 tons and IC or II of more than 3000 tons.
Naantali and Turku, I or II of more than 2000 tons.
Hanko, IA or IB of more than 2000 tons and IC or II of more than 3000 tons.
Taalintehdas, Förby, Koverhar, Inkoo, Kantvik, Helsinki, Sköldvik, Loviisa, Kotka and Hamina, IA or IB 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 schemes in the Quark and Gulf of Finland, south of Kalbådagrund, are 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