National Weather Service Weather Forecast Office

Outdoor Lightning Safety - When a Safe Location Is Not Nearby

For Mariners in both Salt or Freshwater environments

Quick overview:

1) - KNOW THE WEATHER FORECAST BEFORE HEADING OUT
2) - IF YOUR BOAT DOES NOT OFFER PROPER SHELTER FROM LIGHTNING, AND THE SKIES BECOME THREATENING, YOU SHOULD RETURN TO ANY PORT IMMEDIATELY.

IMPORTANT: This document does not discuss how to protect your boat from lightning.

The vast majority of lightning injuries and deaths on boats occur on small aquatic vessels which do not have a cabin. The primary reason for this is there is no place to seek safe shelter in these type of vessels. It is crucial that if you plan to be on a small aquatic vessel which does not have a cabin, that you have access to weather information while on the water. If thunderstorms are forecast, either don’t go out or remain relatively close to port/dock/land. If you are out on the water, and skies are threatening on the horizon, you should get back to any port or land immediately. Once on land, seek safe shelter.

Small boats with cabins may offer a somewhat safer environment in that you are in an enclosed environment. Safety is increased further if the boat has a properly installed lightning protection system. It is important that if you are inside the cabin that you stay away from metal, and all electrical components. STAY OFF THE RADIO UNLESS IT IS AN ABSOLUTE EMERGENCY!

What should you do if you are on a small vessel and lightning becomes a threat? If the vessel has an anchor, then you should properly anchor the boat. The next thing to do is get as low as possible and hope that the vessel does not get struck by lightning.

Large boats with cabins, especially those with lightning protection systems which are properly installed, or metal marine vessels are relatively safe. Remember to stay inside the cabin and stay away from any metal surfaces.

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