In the atmosphere, between the clouds when the area of the left will produce electric charge. Before the electrical discharge of lightning had the Division and accrued charges are so high in the clouds thunderstorm, due to the impact of the hot air rises and the water vapor condenses in the cloud. The voltage between the ground and thunderstorm clouds can reach values of dozens, even hundreds of millions of volts. Between the cloud and ground to form a giant capacitor. The intensity of the electric field of the capacitor between the cloud and the Earth are constantly increasing and if the intensity of the electric field reaches the critical value (25-30 KV/cm) shall start with the discharge or lightning.
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