Threshold values of characteristics of atmosphere instability during thunderstorms

The peculiarities of the development of strong convection in the atmosphere of Western Siberia, Gorny Altay and the Far East were studied on grounds of some characteristics. First of all, it is dynamics of parameters describing temperature stratification of the atmosphere up to the height of 5 km. The integrated characteristics, which, in addition to temperature stratification, include the estimation of humidity of different atmospheric layers, make up the second group. The third group of characteristics is indices evaluating the energy of convective potential of atmosphere. The forth group comprises indices describing vertical and horizontal flows in the atmosphere. The threshold values of some indices at which the thunderstorms are formed are defined.