The bases of data on hazardous hydrometeorological phenomena in Russia and results of statistical analysis

Main principles are considered of formation of special files on observed hazardous hydrometeorological phenomena (HHP) and adverse weather, along with experience of Roshydromet in standardization of registration and reports on their damaging effects. The first base is designed on the basis on hazardous phenomena registered by the hydrometeorological stations according to authorized criteria regardless the damaging effects on economy and population; these data are collected and stored in the State Data Foundation. These are special climatic data series on HHP from the stations; they are used in the studies of extreme and hazardous weather. The second base collects information on adverse and hazardous weather causing economic and social damage, irrespective of the HHP criteria reached or not. Distribution is presented of total case number of hazardous hydrometeorological phenomena causing social and economic damage during 1991-2008.