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This article discusses the parameters of thunderstorm activity in the structure of tropical cyclones that had an impact on the Russian Far East in August 2016. The study shows in detail the change in the cloud mass and describes its structure during the lifetime of the most powerful tropical cyclone Lionrock (2016). It is shown that the density distribution of lightning discharges in the range of tropical cyclones (up to 1000 km), reaching the typhoon stage, is characterized by two local maxima. The distribution density of lightning discharges in the range of tropical cyclones that have reached a strong tropical storm is characterized by one maximum. The lifetime of thunderstorm cells that stand out is 40-50 minutes in average. Before the typhoon stage, the area of thunderstorm cells increased, and then, the number of cells as well as the intensity of discharges in the cell increased, but their lifetime and area decreased.

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On Aug. 29, 2016, the tropical cyclone Lionrock was reported to turn into an extra-tropical storm and go to the shore of the Primorsky Region as monitoring shows, which brought about significant precipitation growth recorded in the north of the coast. Many surveys show the tropical cyclones in this area to transform into extra-tropical ones and become powerful mid-latitude storms with significant damage to coastal and maritime areas. The paper uses WWLLN (World Wide Lightning Location Network) data to study the thunderstorm activity while the tropical cyclone reaches the typhoon level with the maximum wind velocity. This made it possible to identify parameters’ variations of thunderstorm activity during atmospheric vortex phenomena. It also enabled us to determine the emergency probability due to a thunderstorm.