Abstract
The article analyzes the spatiotemporal structure of thunderstorm activity and local electric-field changes in the Northern Tien Shan region based on data from the global WWLLN network and local measurements of the atmospheric electric field obtained by the ELIS-TS complex during 2013–2025. The main thunderstorm season from April to October is considered. During this period, the ELIS-TS complex recorded 3603 events, of which 74.6% were accompanied by negative electric-field changes and 25.4% by positive electric-field changes. Peak activity occurs from June to July, which coincides with the period of maximum convection in this region. A comparison of local measurements with WWLLN data showed that the largest number of recorded electric-field disturbances corresponded to WWLLN-detected events located within the first tens of kilometers from the station. Spatial analysis revealed an increased density of lightning discharges in mountainous and foothill areas, as well as a seasonal shift in thunderstorm activity due to the orographic influence of the terrain. Dividing the study area into lowland and mountainous zones revealed differences in the diurnal activity pattern: the peak occurs earlier in the mountains, indicating earlier convective development over high-altitude terrain.