Lightning Distance Calculator
Calculate how far away a lightning strike is from the time between flash and thunder.
Distance to Lightning
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Kilometers
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Feet
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Sound Speed
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Lightning Safety Rules
30-second rule: If under 30 seconds, seek shelter
30-30 rule: Wait 30 min after last thunder before going outside
6 miles (~30 sec) is the maximum recommended safe distance
No outdoor location is safe during a thunderstorm
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