Federal Office of Meteorology and Climatology MeteoSwiss

Thunderstorms


Level 3 (orange) Level 3 (orange)
Severe thunderstorms possible (stationary/moving):
75 km/h wind , 25 mm/h rain, 2 cm hail		 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
Level 4 (red) Level 4 (red)
Severe thunderstorms (stationary/moving):
110 km/h wind , 50 mm/h rain, 4 cm hail		 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).
DeutschFrançaisItaliano About us Shop
       
General situation Detailed forecast Current weather Ozone layer Development of vegetation Model forecasts Weather events Weather review
Swiss Climate Climate today Climate tomorrow Climate international Observation Systems Climate reports
Products A-Z Aviation Acriculture & Construction industry Road conditions Outdoor Consultancy Data Portal Energy Insurance Public sector Tourism Schools & Universities Phone & Fax Homepage
Research & Development Publications Events Consortia Current projects Completed projects
Danger Weekly outlook Warning overview Additional information Cantons