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Considered are the synoptic mechanisms of the catastrophic flood formation on the Amur River in summer 2013; these enabled revealing the set of reasons responsible for the unprecedented rise of the water level. Demonstrated is the primary importance of the series of polar-front cyclones of the unprecedented duration and intensity being the main circulation link of the summer Far Eastern monsoon. It is revealed that the intensification of monsoon rains is associated with the active participation of the marine tropical air from the Pacific Ocean in frontal processes. The simultaneous deepening of the monsoon low over the land and the strengthening of the subtropical high over the ocean became a reason for the dramatic intensification of the moisture-laden monsoon flow.

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