This article discusses some features of atmospheric circulation in southern areas of the Angara and Baikal regions, which are associated with heavy rainfalls and the formation of flash floods. In 2019 and 2021, synoptic conditions of the formation of precipitation leading to flash floods in the south of the Irkutsk Region differed significantly from the atmospheric dynamics in previous years. The activity of high-altitude cyclogenesis and high-altitude frontal zones increases, causing the blocking of cyclones and an increase in the duration of rains. The maximum rainfall is shifted both to earlier and to later periods.
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