Quick Answer
Crouching in open ground is not safe during a thunderstorm, as it increases the risk of being struck by lightning. Lightning can strike the ground up to 10 miles away from the parent thunderstorm. Instead, seek shelter in a low, sturdy building or a hard-topped vehicle.
Risks of Open Ground
Crouching in open ground during a thunderstorm is a critical mistake that can be fatal. The myth that crouching reduces the risk of being struck by lightning has been largely debunked. In reality, the risk of being struck is determined by the proximity to the parent thunderstorm and the height of the object struck, not the position of the person. In open ground, the risk of being struck is higher due to the lack of any protection from lightning. If you are caught in a thunderstorm and cannot find shelter, move with caution.
Safe Alternatives
If you cannot find shelter, move to an area with the lowest risk of being struck. This includes staying away from tall objects, such as trees, light poles, and power lines. Avoid being near water, as it is an excellent conductor of electricity. If you are in a group, spread out to minimize the risk of multiple people being struck. If a nearby building or hard-topped vehicle is available, seek shelter immediately.
Lightning Detection and Timing
Pay attention to the signs of an approaching thunderstorm, such as darkening skies, increasing wind, and the sound of thunder. If you see lightning, count the seconds until you hear the thunder. A general rule of thumb is that if the time between seeing the lightning and hearing the thunder is 30 seconds or less, the storm is within 6 miles. In this scenario, the risk of being struck is high, and you should seek shelter immediately.
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