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With lightning, follow the 30/30 Rule. The 30/30 Rule states that you should seek shelter if the "Flash-To-Bang" delay (length of time in seconds between a lightning flash and its subsequent thunder), is 30 seconds or less, and remain under cover until 30 minutes after the final clap of thunder.
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With common sense, you can greatly increase your safety and the safety of those you are with. At the first clap of thunder, go to a large building or fully enclosed vehicle and wait 30 minutes after the last clap of thunder before you to go back outside.

Learn more lightning and lightning safety in JetStream - An Online School for Weather.

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