Abstract
In this paper the preconvective environment on days with dangerous weather phenomena, such as thunderstorm, hail and squall on the south-eastern part of Western Siberia was investigated. Various thermodynamic and kinetic parameters calculated from radiosoundings of atmosphere at 00:00 and 12:00 UTC were verified against subsequent with dangerous weather phenomena observations derived from meteorological station data. Average values and atmosphere thermodynamic characteristics variability intervals were analyzed, when dangerous weather phenomena were registered on the southeastern territory of Western Siberia. Threshold values of the thermodynamic characteristics of atmosphere of Western Siberia for different degrees of probability of thunderstorms and hail are determined. Variability of indices values, that characterize convection depending on the underlying surface and the time of its development, are defined.
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