Tordenvær, lyn og byger på sjøen: hva du gjør

Sist kontrollert: 14. oktober 2026

Steg for steg

1. Handle ved første tegn

   Mørke skyer, jevnt økende vind eller sjø, eller en brå vinddreining betyr at et uvær kan være på vei. Hører du torden, er du nær nok til å bli truffet av lynet. Sett kurs mot havn eller trygt ly med en gang.[12][22][14][1][25]

2. Redningsvest på alle

   Vindkast fra et tordenvær kan velte en liten båt. Sørg for at alle om bord har redningsvest på nå.[9][18]

3. Senk farten og sikre båten

   Senk farten for å beholde kontrollen. Stu bort løst utstyr og la mannskapet sitte lavt og midt i båten.[18][19]

4. I seiljolle: slakk seilene i kastene

   Når et brått vindkast treffer, slipp fokka og storseilet til båten begynner å rette seg opp.[21]

5. Gå inn eller kom deg lavt

   Har båten kahytt, bli inne. Hvis ikke, huk deg ned så lavt du kan midt i båten.[2][13][10]

6. Hold deg unna metall og vannet

   Hold deg unna metallbeslag og elektrisk utstyr, og ikke ta på to jordede metallgjenstander samtidig. Hold armer og bein inne i båten.[10][2][5]

7. Senk antennen; radioen bare for nødsituasjoner

   Senk eller surr fast radioantennen og andre høye innretninger hvis de ikke er en del av et lynvernsystem. Ikke bruk radioen, med mindre det er en nødsituasjon.[6][16]

8. Kommer du deg ikke i land? Vent det ut

   Kommer du deg ikke tilbake til land, anbefaler US National Weather Service å ankre og gjøre seg så lav som mulig. Tordenvær varer vanligvis kort, så det er bedre å vente det ut enn å kjøre gjennom det.[15][3]

9. Hvis noen blir truffet

   Varsle om hjelp umiddelbart. En person som er truffet av lynet, har ingen elektrisk ladning, så det er trygt å ta på og hjelpe vedkommende.[20][7]

10. Etter uværet: sjekk båten

    Ble båten truffet av lynet, eller tror du at den ble det, sjekk det elektriske anlegget og kompasset for skader før du stoler på dem.[8]

Unngå

• Ikke vent på torden eller regn før du går inn. Lynet kan slå ned mange kilometer foran uværet.[4][14]
• Ikke dra ut hvis det er meldt tordenvær.[1]
• Ikke ta på mer enn én jordet metallgjenstand samtidig.[10]
• Ikke la hender eller føtter henge i vannet.[5]
• Ikke bruk radioen til prat når det lyner; spar den til nødsituasjoner.[16]

Før du drar ut

• Før du drar ut: sjekk sjøværmeldingen og farevarslene for tordenvær eller byger.[24][1]
• Før du drar ut: husk at vindkastene kan være 40 % sterkere enn den varslede middelvinden, og enda sterkere i et uvær.[23]
• Før du drar ut: planlegg en rømningsvei og finn ut på kartet hvor du kan søke ly.[11][26]
• På sjøen: følg med på været fortløpende på maritim VHF.[27]

Ofte stilte spørsmål

Kilder

Kildene siteres på originalspråket.

1. US National Weather Service (NOAA) (2026-10-14): “It is therefore strongly recommended you do not venture out if thunderstorms are a possibility. If you do venture out and recognize thunderstorms nearby, head to port or safe shelter as quickly as possible.”
2. US National Weather Service (NOAA) (2026-10-14): “If your boat has a cabin, then stay inside and avoid touching metal or electrical devices. If your boat doesn't have a cabin, stay as low as you can in the boat.”
3. US National Weather Service (NOAA) (2026-10-14): “Keep in mind that thunderstorms are usually brief so waiting it out is better than riding it out.”
4. US National Weather Service (NOAA) (2026-10-14): “Stop all activities when there is lightning or when weather conditions look threatening. The first lightning strike can come out of a clear blue sky many miles ahead of an approaching thunderstorm cloud.”
5. US National Weather Service (NOAA) (2026-10-14): “Keep arms and legs in the boat. Do not dangle them in the water. Water conducts electricity from lightning.”
6. US National Weather Service (NOAA) (2026-10-14): “Lower, remove or tie down the radio antenna and other protruding devices if they are NOT part of a lightning protection system.”
7. US National Weather Service (NOAA) (2026-10-14): “Victims do not carry an electrical charge after being struck.”
8. US National Weather Service (NOAA) (2026-10-14): “If a boat has been struck by lightning, or is suspected of having been struck, check the electrical system and the compasses to ensure that no damage has occurred.”
9. US National Weather Service Melbourne (NOAA) (2026-10-14): “If a thunderstorm threatens while afloat, be sure everyone aboard is wearing a life jacket as a small boat can be overturned by gusty winds.”
10. US National Weather Service Melbourne (NOAA) (2026-10-14): “If lightning is threatening, keep below decks if possible; keep away from metal objects that are not grounded to the boat's protection system; don't touch more than one grounded object at the same time.”
11. US National Weather Service Melbourne (NOAA) (2026-10-14): “Have an escape plan in mind. Thunderstorms and weather related hazards form quickly. Never let these storms cut off your route back to land.”
12. US National Weather Service Melbourne (NOAA) (2026-10-14): “Dark, threatening clouds usually foretell the approach of severe weather. Other things to watch for are a steady increase in wind or seas or an increase in wind opposite in direction to a strong current.”
13. US National Weather Service Miami (NOAA) (2026-10-14): “Get out of the water, off the beach and out of small boats. If caught in a boat, crouch down in the center of the boat, away from metal hardware.”
14. US National Weather Service Miami (NOAA) (2026-10-14): “Remember, if you can hear thunder, you are close enough to the storm to be struck by lightning.”
15. US National Weather Service (NOAA) (2026-10-14): “If you are out and cannot get back to land and safety, drop anchor and get as low as possible.”
16. US National Weather Service (NOAA) (2026-10-14): “Remember to stay inside the cabin and away from any metal surfaces. Stay off the radio unless it is an emergency!”
17. US National Weather Service (NOAA) (2026-10-14): “Wait 30 minutes until after the last rumble of thunder before going back to the beach.”
18. Coastguard New Zealand (2026-10-14): “If you’re close to shore, consider heading back early. If you’re further out, reduce speed, secure loose items, and ensure all passengers are wearing lifejackets if not already.”
19. Coastguard New Zealand (2026-10-14): “Stabilise your boat by stowing loose gear and get your crew to sit low and in the middle of the hull to further improve stability and safety, especially in smaller boats.”
20. Coastguard New Zealand (2026-10-14): “And lastly, if you are in danger, call for help. Don’t risk a fatal event, as your pride got in the way of radio CH16.”
21. Transport Canada – Rental Boat Safety Checklist (Sailing Dinghy) (2026-10-14): “Release the jib and main sail until the boat starts to flatten out when there are unexpected gusts of wind”
22. Australian Bureau of Meteorology (2026-10-14): “sudden increase in wind speed or change in wind direction”
23. Australian Bureau of Meteorology (2026-10-14): “Forecasts show average wind speeds. Wind gusts can be 40% stronger than the average wind speed and even stronger during a storm.”
24. Australian Bureau of Meteorology (2026-10-14): “Check for mention of thunderstorms or squalls, as this may indicate strong winds could develop faster.”
25. Transport Canada – Safe Boating Guide (TP 511E) (2026-10-14): “Summer thunderstorms can strike quickly and without warning. Keep your eye on the sky when you’re out on the water. If it starts to look dark and cloudy, and conditions are changing quickly, head for shore.”
26. Transport Canada – Safe Boating Guide (TP 511E) (2026-10-14): “Remember to check your up-to-date nautical charts in advance so you’ll know where to find shelter.”
27. Transport Canada – Safe Boating Guide (TP 511E) (2026-10-14): “If you have a marine radio, you can get weather updates while you’re on the water.”

Flere nødguider

Nødnumre på sjøen etter land → Slik sender du en MAYDAY-melding → Nødkort for utskrift →