Lightning.

The Electrifying Weather Lightning is known as nature's fireworks. It is a sudden electric discharge. Also recognized as a spark of electricity between a cloud and the ground. Thunderstorms are where lightning and thunder occur. They are formed when a cold front moves in and meets a warm front. Also cumulonimbus clouds produce thunderstorms. Cumulonimbus clouds are formed when there is enough upward motion, and enough moisture in the air to produce a deep cloud …

…The lightning current can branch off to a person from a tree, fence, pole, or other tall objects. People can also be injured indirectly, by the lightning current traveling through power lines, telephone lines, and plumbing pipes. And the person using a telephone, or in contact with an electric appliance, or plumbing fixture can be injured. The best way to protect yourself from a thunderstorm is to stay indoors, and not using any electrical appliances.