The Federal Environment Office is warning water levels in the Rhône River and Lake Geneva are very high.
The combination of heavy rain and the melting snow is the main reason.
The Rhône in Valais now has a level three warning in place in many areas, especially between Sion and Aigle and a level 2 in Brig.
Lake Geneva is also under a level 2 alert.
The waters are expected to reach their peak tomorrow – but more rain could extend the risk.
Heat kills more than the roads
Heat now kills more people in Switzerland than road accidents.
Geneva left with the bill after G7
Geneva cantonal minister Carole-Anne Kast says Bern gave in too easily to France over who pays for last month's G7 summit in Évian.
High wildfire risks increases further
The wildfire risk has climbed to the highest level so far, with Valais now under "very high danger" and open fires banned across several cantons.
HPV vaccines for all
Switzerland has become the first country in Europe to widen its HPV vaccine to everyone aged 9 to 45, including men up to 45.
Yverdon maps its heat island
With the Plateau facing 35 degrees on Thursday, Yverdon-les-Bains has installed 15 sensors to work out how hot its own streets really get.
Shaqiri meets hundreds of fans in Geneva
Hundreds of football fans packed Geneva's La Praille shopping centre yesterday to meet Swiss star Xherdan Shaqiri.
