Thunderstorm - that it? Where do dissecting all sky lightnings and threatening rolls of thunder undertake from? A thunderstorm is this natural phenomenon. The lightnings named electric digits can appear into clouds (кучево-дождевых), or between an earth surface and clouds. They, as a rule, are accompanied by thunder. Lightnings are related to the thundershower rains, squall wind, and quite often and with a hail. Uneven heating of the ground layers. For example, overwater at the substantial difference of temperatures. Above cities a storm intensity will be some stronger, than in outskirts. At expulsing by cold air warm. Frontal convention often develops simultaneously with обложными and stratified-rain clouds (by clouds). At getting up of air in mountain ranges. Even small sublimities can result in strengthening of formations of clouds. It is a force convection.