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Maximum expected hailstone sizes (radar)
Regions and cities, Environment
The data contain the largest hailstone size by month and year, respectively, as well as the average number of days with hailstone sizes from 2 cm and 4 cm, respectively. Hailsto...
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Number of hail days
Regions and cities, Environment
The data contain the monthly and yearly number of hail days and the long-term average number of hail days per year or per month of the summer half-year (April to September), per...
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Overland flow map
Regions and cities, Environment
The areas affected by overland flow were determined using a simplified method the over entire Switzerland and Liechtenstein. They were determined by modelling without any verifi...
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Map of potential permafrost distribution
Regions and cities, Environment
The map shows the potential permafrost distribution in Switzerland based on modelling. In Switzerland, above 2400 metres the ground can be permanently frozen, depending on its g...
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Flood alert map
Regions and cities, Environment
The flood alert map shows the current flood danger level (1 to 5) for all and for the regions in relation to small and medium-sized rivers. The rivers of national interest are d...
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Flood alert map for small catchments
Regions and cities, Environment
The FOEN also issues information when a sharp rise in small and medium-sized river levels is expected locally. In these cases, it is impossible to say precisely which rivers wil...