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  • Beginning of the event: 22 September 1993
  • End of the event: 25 September 1993
  • Duration of the event: 4 days

Affected regions: the Upper Valais (Brig, southern slope of the Simplon massif, Saastal, Mattertal) and Ticino (around Lake Maggiore and in the north of Ticino).

Note: in Ticino this event marked the beginning of a very wet period which lasted until mid-October. The entire rainy period, rather than this sole event, is responsible for the floods that occurred in that period (FOEN, 1994).
Map of Switzerland that shows the affected regions with hatched lines and the stations used for the analysis of the event with dots.
Regions affected by the precipitation event of 22-25 September 1993 (hatched) and stations used for the analysis of the event. Red dots indicate stations measuring hourly precipitation and blue dots indicate stations measuring daily precipitation.

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