The spatial distribution of the thunderstorm activity was obtained for the territory of Western Siberia. In the paper three characteristics are considered. They are density of lightning discharges to the ground, the average number of days with a thunderstorm and the average duration of thunderstorms in hours. The observations of the network of 52 weather station and satellite information on the number of lightning discharges are used for the mapping thunderstorm activity characteristics. The obtained maps are qualitatively compared with each other and with the results of other studies.
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.
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