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September 10, 2025

The Devastating Convective Wind Event of 24 July 2023 in La Chaux-de-Fonds, Switzerland : Causes, Probable Mesoscale and Storm-Scale Mechanisms at Play and Nowcasting Implications

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Analysis reveals a supercell thunderstorm's role in a deadly event, indicating high damages and complex interactions with local topography.

The storm resulted in one fatality and significant economic damage, with costs exceeding 135 million Swiss Francs.
Maximum recorded wind gusts reached 217 km/h, classified as an IF2 event on the International Fujita Scale.
Post-event analysis utilized multiple data sources to determine the involvement of both a microburst and a tornado.
The unique interactions of the storm with the Jura topography could explain the region's history of tornado occurrences.

Peyraud et al. (2025) studied this question.

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Analysis reveals a supercell thunderstorm's role in a deadly event, indicating high damages and complex interactions with local topography.