The Swiss national weather service has on Friday issued a storm alert for most of the country.
MeteoSwiss says a cold front moving eastward from France is expected to hit Switzerland with gusts of up to 100 kilometres an hour.
It said most of the country would be hit by severe rainfall and even hail from Friday into Saturday. Most of the country has a storm warning of level four, the second highest under a system introduced in May. It is the first time such an alert has been issued.
The warning comes after ten days of swelteringly hot weather in Switzerland, in which temperatures have regularly topped 30 degrees Celsius.
swissinfo.ch and agencies