An object-based and Lagrangian view on an intense hailstorm day in Switzerland as represented in COSMO-1E ensemble hindcast simulations

Brennan, Killian P.; Sprenger, Michael; Walser, André; Arpagaus, Marco; Wernli, Heini

doi:https://doi.org/10.5194/wcd-6-645-2025

Articles | Volume 6, issue 2

https://doi.org/10.5194/wcd-6-645-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wcd-6-645-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 6, issue 2

Research article

|

24 Jun 2025

Research article |

| 24 Jun 2025

An object-based and Lagrangian view on an intense hailstorm day in Switzerland as represented in COSMO-1E ensemble hindcast simulations

Killian P. Brennan, Michael Sprenger, André Walser, Marco Arpagaus, and Heini Wernli

Supplement

https://doi.org/10.5194/wcd-6-645-2025-supplement

Data sets

Supplement Data to: An object-based and Lagrangian view on an intense hailstorm day in Switzerland as represented in COSMO-1E ensemble hindcast simulations Killian P. Brennan et al. https://doi.org/10.3929/ethz-b-000702890

Model code and software

KillianBrennan/cell_tracker: Cell tracker as used for analysis in the WCD case study paper (WCD_case_paper) Killian Brennan https://doi.org/10.5281/zenodo.12685276

Short summary

We studied severe hailstorms that occurred in Switzerland on 28 June 2021 using a weather prediction model to understand how they evolved. We found that the storms moved toward areas with more storm energy. Hailfall was quickly followed by heavy rain. Just before the storms died out, the air feeding them stopped coming from near the ground. We also observed a delay between different types of precipitation forming in the incoming air.