Weather and Climate Dynamics
Weather and Climate Dynamics
WCD
Articles | Volume 6, issue 2
Articles | Volume 6, issue 2
https://doi.org/10.5194/wcd-6-447-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wcd-6-447-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 6, issue 2
Research article
 | 
17 Apr 2025
Research article |  | 17 Apr 2025

Revealing the dynamics of a local Alpine windstorm using large-eddy simulations

Nicolai Krieger, Heini Wernli, Michael Sprenger, and Christian Kühnlein

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Short summary
This study investigates the Laseyer, a local windstorm in a narrow Swiss valley characterized by strong southeasterly winds during northwesterly ambient flow. Using large-eddy simulations (LESs) with 30 m grid spacing, this is the first study to reveal that the extreme gusts in the valley are caused by an amplifying interplay of two recirculation regions. Modifying terrain and ambient wind conditions affects the windstorm's intensity and highlights the importance of topographic details in LES.
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