Bolt from the blue

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Anvil to ground lightning strike
Anvil to ground lightning strike

A bolt from the blue is a term which refers to a form of lightning that strikes out of an apparently cloudless sky. In fact, it actually originates from the anvil cloud atop a thunderstorm which may be as far as twenty miles away. It carries around ten times the current of an ordinary bolt of lightning and has a positive charge while most other lightning has a negative one. This commonly is known as positive lightning.

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