Storm Lyly, the first storm with observed hurricane-force winds in Finland
La tempête Lyly, première tempête à avoir observé des vents de la force d'un ouragan en Finlande
Laurila, Terhi K. ; Rantanen, Mika ; Punkka, Ari-Juhani
Année de publication
2025
On 1 November 2024, Storm Lyly set a Finnish record for 10min average wind speeds (33.5ms?1 in Rauma Kylmäpihlaja), marking Finland's first hurricane-force winds and causing significant damage. The storm featured a strong pressure gradient over the Gulf of Bothnia and, while the low-pressure centre was distant from the strong winds, thpotentially a secondary low over the Bothnian Bay. The flow of cold air over relatively warm sea led to steep low-tropospheric lapse rates. Combined with a strong low-level jet, this allowed strong and gusty winds in the upper parts of the boundary layer to reach the surface.</p>
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