Often storms are observed in areas with high humidity. Rare storm in the desert, because there is dry air. Not often you can observe this phenomenon in the Northern hemisphere. Tropical storms also a rare phenomenon, but in a temperate climate can count 30-50 thunderstorm days per year. In the mountains thunderstorms are more frequent than on the plain. With the side where the winds blow stronger, storms are more frequent. The reason is that at the meeting of the air flow from the mountain obstacle is forced to rise and as a consequence the formation of storm precipitation.