Federal Office of Meteorology and Climatology MeteoSwiss

Thunderstorms


Yellow Possible consequences
  • Gusts of wind reaching or exceeding 75 km/h.
  • Precipitation intensity 25 mm/h
  • Hailstones with diameter of 20 mm or more.

Recommendations (The instructions of the authorities are to be followed at any rate!)
  • Observe the local weather development, get yourself informed and adapt your behaviour to the present conditions.
Orange Possible consequences
  • Sudden occurrence of flood waves in brooks.
  • Wind-thrown trees.
  • On a local level, landslides from steep slopes are possible.
  • Hail damage and lightning strikes.
  • Failure of drainage and sewage systems.
  • Subways, underground parkings and basement/cellar rooms might be flooded.
  • Road, rail and air traffic obstructed.
  • Ship traffic endangered due to sudden, very strong gusts of wind.

Recommendations (The instructions of the authorities are to be followed at any rate!)
  • Observe the local weather development, get yourself informed and adapt your behaviour to the present conditions.
  • Avoid ridges and groups of trees at risk of being struck by lightning.
  • Do not pass over flooded street sections or pass them slowly.
  • In case of open-wire lines: Limit the use of telephones and electric devices.
  • Keep away from exposed trees or groups of trees.
  • Avoid mountain hikes and walks in the forest.
  • Stay away from beds of brooks and avoid areas with steep slopes.
  • Do not make unnecessary phone calls (network failure).
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