I temporali hanno portato in breve tempo grandi quantità di acqua e in parte grandine su ampie zone dell'Altopiano centrale in serata. Il fronte si è mosso da sud-ovest a nord-est e ha raggiunto Zurigo verso le 20.00. I servizi meteorologici hanno lanciato l'allerta.
Secondo SRF Meteo, la maggiore quantità di pioggia in tre ore è stata misurata alle 20.00 a Chateau d'Oex, nel canton Vaud, con 60,5 millimetri, seguita da Savognin, nei Grigioni, con 52,6 millimetri.
Altre stazioni di misurazione hanno registrato quantità d'acqua nettamente inferiori. Poco dopo le 21.00, MeteoSvizzera ha segnalato forti temporali all'aeroporto di Zurigo-Kloten con raffiche di vento di quasi 70 chilometri orari e numerosi fulmini. In serata sono caduti grossi chicchi di grandine in molte località.
Al passaggio sul lago di Zugo, il maltempo ha anche provocato la formazione di una tromba d'acqua, le cui immagini sono state pubblicate su Twitter da MeteoSvizzera.
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