Quick Answer
Being in water during a thunderstorm significantly increases your risk of being struck by lightning. This is because water is a conductor of electricity, which means that if lightning strikes the water, it can easily travel to a person in the water. Being in or on the water during a thunderstorm can be fatal.
Lightning Conduction in Water
Water is an excellent conductor of electricity, with a conductivity of about 1.0 million times that of air. This means that if lightning strikes the water, it can easily travel through the water to a person in the water, potentially causing electrocution. To put this in perspective, a swimming pool can be considered a massive conductor of electricity, making it a hazardous place to be during a thunderstorm.
Safe Distance and Time Calculations
To determine the safety of being in or on the water during a thunderstorm, it’s essential to understand the concept of the “30/30 rule.” This rule states that if the time between lightning flashes is 30 seconds or less, and the distance between the lightning and you is 30 feet or less, it’s not safe to be in or on the water. To calculate the safe distance, use the following formula: time (in seconds) x 1 mile per 5 seconds = safe distance in miles. For example, if the time between lightning flashes is 10 seconds, the safe distance would be 2 miles (10 x 1 mile per 5 seconds).
Precautions and Safety Measures
When in or on the water during a thunderstorm, it’s crucial to take immediate action to ensure your safety. If you’re swimming or wading, get out of the water as quickly and safely as possible. If you’re in a boat, stay away from metal objects such as masts, booms, and engines, as these can conduct electricity. If you’re in a pool or on a dock, get out of the water and move to a safe location, such as a building or a hard-topped vehicle.
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