HOW TO ...

...LOCATE A THUNDERSTORM

Water droplets colliding inside storm clouds cause electrons to move so quickly that a large electrical spark is created. This is lightning. The air along its path is heated so intensely and expands so much that it creates a very loud noise— thunder. But although lightning and thunder occur together occur together, we see the lightning some time before we hear the thunder because the speed of light is about a million times that of a sound.

It is possible to estimate how far away a thunderstorm is by counting the number of seconds between the lightning flash and the thunderclap. Divide what you get by three and that will give you the approximate distance in kilometers.

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see: The Boy's Book: How to Be the Best at Everything, Buster Book