Lightning is a giant spark of electricity. It builds up as ice and water particles crash into each other inside the storm cloud.
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A single bolt can heat the air around it to roughly 50,000°F. That is about five times hotter than the surface of the Sun.
The air heats up so fast that it expands with a bang. That sound is thunder.
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Lightning can strike well away from the storm itself, so you don't need to be under the rain to be at risk.
The National Weather Service sums it up simply: when thunder roars, go indoors. There is no safe place outside during a thunderstorm.
Once you are inside, wait until 30 minutes after the last thunder before heading back out.



