The case of successive passage of two mesoscale convective systems (a mesoscale convective complex and a squall line) in the vicinity of Tomsk, which was observed on 26 June 2020 is analyzed. It is noted that the passage of the mesoscale convective complex corresponds to a sharp change in the structure of the vertical temperature profile and a high value of the vertical temperature gradient. The time interval that precedes the development of thunderclouds corresponds to the value of the vertical temperature gradient for the IMCES SB RAS territory – 2.18 °/100 m. Sudden changes in values from the positive vertical temperature gradient to the negative and vice versa correspond to the passage of the squall line. The data of the electric field potential gradient profile and the intensity of thunderstorm activity allow us to consider in more detail the dynamics of changes in the atmospheric boundary layer.
The spatio-temporal variability of the temperature of the lower atmosphere layer during the development of abnormally early thunderstorms and squalls in the southeast of Western Siberia on the example of the surrounding area of Tomsk is analyzed. It is noted that the highest density of lightning discharges during the event under study is not over the centers of the zones with the highest temperatures, but over their peripheral parts, where large contrasts of temperature changes are observed. The time intervals that preceded the development of storm clouds are correlated with the values of the vertical temperature gradient for the territory of the IMCES SB RAS – 2.2 º/100 m and 1.4 º/100 m for the village of Anikino.
Estimations of the morphological and microphysical characteristics of mesoscale convective complexes (MCC) in the south of Western Siberia for 2010–2019 years received. It was noted that the MCC lengths along latitude and longitude are on average ~ 140 and 120 km, and typical ranges of their change (limited by the 25th and 75th percentiles) are 120÷160 km and 100÷130 km, respectively. The MCC upper boundary height is on average 12 km and generally changes in the range from 9 to 13 km. The MCC cloud particles effective radius is on average 27 microns and typical range of his change are 25÷29 microns. The integral water content of MCC clouds is on average 1,2 kg/m2 , and most often varies in the range from 0,8 to 2,1 kg/m2 .
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