What question did this study set out to answer?

The research aims to assess how anthropogenic climate change influences extreme hail events, particularly one in Zurich, Switzerland.

February 8, 2026Open Access

A storyline climate-change attribution study of the extreme hail event in Switzerland on 28 June 202

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Explores climate change's role in an extreme hail event in Switzerland, suggesting significant impacts on hail frequency and size.

The research aims to assess how anthropogenic climate change influences extreme hail events, particularly one in Zurich, Switzerland.
Utilized a storyline approach to analyze an extreme hail event on June 28, 2021.
Simulated the event using the Weather Research and Forecasting model with ERA5 data.
Compared factual simulations with counter-factual simulations that excluded climate change signals.
Computed climate change signals using global climate model data from pre-industrial and current-day comparisons.
Counter-factual simulations showed significantly less hail compared to factual simulations.
Hail diameters of ≥ 3 cm were particularly impacted, showing a reduction in the counter-factual scenarios.
The area affected by larger hail sizes (> 3 cm and > 5 cm) increased due to climate change influences.

Trapp et al. (2026) studied this question.

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February 8, 2026Open Access

View Full Paper

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Authors

Explores climate change's role in an extreme hail event in Switzerland, suggesting significant impacts on hail frequency and size.

The research aims to assess how anthropogenic climate change influences extreme hail events, particularly one in Zurich, Switzerland.
Utilized a storyline approach to analyze an extreme hail event on June 28, 2021.
Simulated the event using the Weather Research and Forecasting model with ERA5 data.
Compared factual simulations with counter-factual simulations that excluded climate change signals.
Computed climate change signals using global climate model data from pre-industrial and current-day comparisons.
Counter-factual simulations showed significantly less hail compared to factual simulations.
Hail diameters of ≥ 3 cm were particularly impacted, showing a reduction in the counter-factual scenarios.
The area affected by larger hail sizes (> 3 cm and > 5 cm) increased due to climate change influences.

Trapp et al. (2026) studied this question.

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