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Current thunderstorm hazards

Updated on: 29.09.2016, 15:25

Current thunderstorm hazards in Switzerland

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Thunderstorms: No or minor danger, level 1

Kontextspalte

Danger level 1 (No or minor danger)
Danger level 2 (Moderate danger)
Danger level 3 (Considerable danger)
Danger level 4 (High danger)
Danger level 5 (Very high danger)
No danger level
Danger level 1 (No or minor danger)

Thunderstorm warnings are only issued for categories 3 and 4.

Danger level 2 (Moderate danger)

A thunderstorm event that is usual for the time of year (for which, therefore, no special warnings are issued).

Danger level 3 (Considerable danger)
  • Effects:
    • Flash flooding of streams
    • Toppling of trees
    • Possibility of localised landslides on steep slopes
    • Damage from hail and lightning strikes
    • Failure of drainage and sewer systems.
    • Flooding of underpasses, underground garages and cellars.
    • Disruption to road, rail and air traffic
    • Danger to vessels on lakes from very strong gusts of wind arising rapidly without warning
  • Behaviour:
    • Keep an eye on local weather developments
    • Seek shelter of lightning strikes, hail or storms
  • Description of measurement and prognostic values:
    • Severe thunderstorm (flash thunderstorm; localised, warning time 0 to 2 hours): 90-120 km/h, 2-4 cm (hailstones), 30-50 mm/h
Danger level 4 (High danger)
  • Effects:
    • Flash flooding of streams
    • Toppling of trees
    • Possibility of localised landslides on steep slopes
    • Damage from hail and lightning strikes
    • Failure of drainage and sewer systems.
    • Flooding of underpasses, underground garages and cellars.
    • Disruption to road, rail and air traffic
    • Danger to vessels on lakes from very strong gusts of wind arising rapidly without warning
  • Behaviour:
    • Keep an eye on local weather developments
    • Seek shelter of lightning strikes, hail or storms
  • Description of measurement and prognostic values:
    • Very severe thunderstorm (flash storm, local; warning time 0 to 2 hours): > 120 km/h, >4 cm hailstones, >50 mm/h
Danger level 5 (Very high danger)

Thunderstorm warnings are only issued for categories 3 and 4.

No danger level

No evaluation.