Lightning is a high intensity spark generated by an electric discharge between a cloud and the ground between different parts of the same cloud or two of them. In some clouds, water droplets or ice crystals are divided into particles with positive and negative charge. The first are at the top of the cloud and the latter at the bottom. The electrical discharge occurs between them and, in general, the soil, which is positively charged. Thunder is the sound hoarse and rumbling produced by the electric shock as a result of overheating of the air surrounding the lightning (visual manifestation of the beam) at a temperature of 15,000 ° C.
The rays, according to their shape, are classified in forked, zigzag, diffuse and globular. The first are the most dangerous. The zigzag-shaped roofs. The downloads are fuzzy linear beyond the horizon produced. The globular-shaped balloons are descending from the sky fiery and dissipate upon reaching land.
To calculate how far away a storm from any point it is necessary to count the seconds between the appearance of lightning and the roar of thunder. Three seconds of difference between the two phenomena are equivalent to one kilometer. Through this relationship determines the distance from the storm to the place where the observer.