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Lightning striking a forest at night. The lightning illuminates a small red cottage.
When you see a flash of lightning, you can count to estimate how far away it strikes. Photo: Thomas Adolfsén/Johnér

Lightning and thunder

Lightning strikes can cause fires, power cuts and disruption to telecommunications. Learn how to protect yourself during a thunderstorm.


The risk of being struck by lightning is small, but a direct lightning strike can cause severe injury or be fatal.

Things to keep in mind during a thunderstorm

  • Stay indoors.
  • Avoid being out in open fields.
  • Unplug cables from wall power outlets.
  • Do not stand under trees or other tall objects.
  • Avoid being in or on the water.
  • It is generally safer to be inside buildings during a thunderstorm.
  • Avoid touching or standing near lights or other electrical appliances, water systems (taps and showers) or fireplaces.
  • Avoid going out onto balconies or verandas, for example.
  • Staying in tents, open boats and sailing boats (unless they are properly sheltered) or on bicycles and motorbikes can also be dangerous.
  • An umbrella, a golf club, a fishing rod or a kite on a string can act as a lightning conductor and should be avoided during a thunderstorm.
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