Scientific synthesis reports and assessments
Scientific synthesis reports and assessments
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Articles | Volume 7-osr10
Articles | Volume 7-osr10
https://doi.org/10.5194/sp-7-osr10-16-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Report:
10th edition of the Copernicus Ocean State Report (OSR10)
https://doi.org/10.5194/sp-7-osr10-16-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 7-osr10
30 Sep 2026
 | OSR10 | Chapter 4.2
 | 30 Sep 2026 | OSR10 | Chapter 4.2

Record low sea levels in the Bothnian Bay in November 2024

Laura Tuomi, Milla M. Johansson, Andrew Twelves, Mika Rantanen, Priidik Lagemaa, Hedi Kanarik, Jani Särkkä, Urmas Raudsepp, and Antti Westerlund

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Short summary
A record low sea level of −153 cm, 34 cm below the previous minimum, was measured in the Bothnian Bay on 21 November 2024. This extreme event was caused by a strong and long-lasting windstorm that followed an unusual track. The Copernicus Marine Service Baltic Sea forecast system accurately predicted the event 3–4 days in advance. However, forecasts with longer lead times failed to predict the record low sea level, although they did indicate a significant drop in sea levels during the storm.
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10th edition of the Copernicus Ocean State Report (OSR10)
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