To avoid finding yourself in great danger, especially if you are an athlete, mountaineer, fisherman, farmer, etc., or you are otherwise often outdoors, please find out the weather conditions beforehand. That is particularly important if you will be in an area where it could be difficult to find protection in case of a thunderstorm. Never underestimate the weather or any other natural phenomenon indeed.
As soon as you see lightning in the sky, you must seek a safe place immediately to protect yourself. Even when you can only hear thunder, you are already in danger if you have not taken appropriate precautions.
If the interval between flashes of lightning is 30”, then the thunderstorm is within 10 km away from you, and you are in imminent danger of being struck by lightning.
For more information, please follow the link: Lightning ... Do's & Don'ts