Abstract
Analyzed are the synoptic and hydrological conditions of the generation of extremely high water content of Primorye rivers in the autumn of 2012. Revealed are the general features of atmospheric circulation, precipitation, water content, and hydrological regime of rivers. Presented are quantitative parameters characterizing the extremity of observed events. The expert assessment of the probability of such combination of events demonstrates that its return period is about 500–1000 years if there is assumption on the stationarity of processes. Taking into account the revealed facts and available assessments of climate changes it can be supposed that the analyzed event rather indicates real changes in the hydrological regime of the region than represents a rare random phenomenon.
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