Lightning may be thought of as a huge spark of electricity. During a thunderstorm, very large electric charges build up insides the clouds and on the ground. The charges build up insides the clouds and on the ground.
The charges build up until a flash of lightning shoots through the air between them. Lightning can flash from the cloud to the ground or between two clouds. Lightning is a sequence of flashes. First a main stroke zigzags to the ground. The main flash then surges upwards. Other flashes may follow in quick succession. When the lightning discharges its electricity to Earth, it tends to strike at a high point, such as a mountain, a tree or a tall building. Lightning flashes produces about 100 million volts of electricity.
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