In the Bay of Bothnia the ice drifts to south-southeast.
In the northern Bay of Bothnia there is 45-75 cm thick, in places rotten, fast ice in the archipelago to Kemi 3 and Oulu 3. Off the fast ice edge there is approximately 5-15 nautical miles wide lead with thick ice floes in places. Farther south there is 15-60 cm thick ridged very close and close ice approximately to the line Kalajoki - Rödkallen. There are leads and areas of open water in the ice field. Farther out 5-40 cm thick drift ice of variable concentration. The ice edge runs approximately along the line Ykskivi - Simpgrundet.
In the southern Bay of Bothnia there is rotten fast ice in the inner archipelago. Farther out ice-free.
In the Quark there is rotten ice in the inner archipelago. Farther out ice-free.
In the Gulf of Finland it is ice-free.
Icebreakers: Otso, Kontio and Polaris assist in the Bay of Bothnia.
Restrictions to navigation: Minimum ice class and deadweight required of assisted vessels:
Tornio, Kemi and Oulu, IA of more than 4000 tons.
Raahe, IA of more than 2000 tons.
Kalajoki, IA and IB of more than 2000 tons.
Kokkola and Pietarsaari, I and II of more than 2000 tons.
Lake Saimaa and the Saimaa canal, II over 2000 tons.
The Saimaa Canal will be opened to traffic on 29th of April.
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