Abstract
The days with large number of lightning discharges in Yakutia and its central part were associated with atmospheric circulation types classified by method of B.L. Dzerdzeevskii. The daily lightning number was obtained by three lightning location systems detecting radiopulses of very low frequency radiated by lightning discharges. The days with intense thunderstorms were selected by the 0.7 level of maximum lightning number in summer season, and the days of minimum lightning activity were selected by 0.3 level of maximum. The elementary circulation mechanisms (ECM) were revealed for severe thunderstorms in Yakutia: ECM 8a, 8dw, 9a, 12a of north meridional circulation group, ECM 13s of south meridional circulation, ECM 2b of zonal circulation and ECM 3 of the disturbace of zonal circulation. Generally, the intense thunderstorms were associated with cyclones of southern outlets of Far East summer monsoon and outlets moving from southwestern.
Highlights
The problem of relation between thunderstorms and synoptic processes remains open for individual regions
The meteorological state of thunderstorms is formed by atmospheric circulation, which has a complex interrelated character throughout the northern hemisphere
Lightning activity in Yakutia is observed by several lightning location systems (LLS) that detect very low frequency (VLF) electromagnetic radiation of lightning strokes
Summary
The problem of relation between thunderstorms and synoptic processes remains open for individual regions. As it was found in [1], atmospheric circulation macro processes last as series of long epochs. The probability of thunderstorm occurrence assessed by indices of atmospheric instability is much lower than the forecasting of other weather conditions. Such meteorological indices describe the state of mesoscale convective instability through standard parameters of temperature and humidity at different pressure levels [2]. The meteorological state of thunderstorms is formed by atmospheric circulation, which has a complex interrelated character throughout the northern hemisphere. As the main source of VLF pulses, the parameters of lightning activity in Yakutia were studied [4]
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