Articles | Volume 2, issue 4
https://doi.org/10.5194/wcd-2-1167-2021
https://doi.org/10.5194/wcd-2-1167-2021
Research article
 | 
06 Dec 2021
Research article |  | 06 Dec 2021

Multi-day hail clusters and isolated hail days in Switzerland – large-scale flow conditions and precursors

Hélène Barras, Olivia Martius, Luca Nisi, Katharina Schroeer, Alessandro Hering, and Urs Germann

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Short summary
In Switzerland hail may occur several days in a row. Such multi-day hail events may cause significant damage, and understanding and forecasting these events is important. Using reanalysis data we show that weather systems over Europe move slower before and during multi-day hail events compared to single hail days. Surface temperatures are typically warmer and the air more humid over Switzerland and winds are slower on multi-day hail clusters. These results may be used for hail forecasting.