Main types of synoptic processes and circulation types generating heavy precipitation events in Armenia

The results of synoptic analysis and objective Lamb circulation classification scheme (LAMB) during the days with heavy precipitation events in Armenia are presented. An analysis of synoptic situations in the area of Armenia and Southern Caucasus for the researched period 2001–2009 has shown that there are seven types of synoptic process characteristic of days with heavy precipitation events in Armenia. Adoption of the LAMB made it possible to identify the typical circulation types for each type of the synoptic process singled out. The results suggest that the LAMB is able to recognize the typical pattern of the distribution of sea level pressure field for each type of the synoptic processes. However, the use of the LAMB is further complicated in Southern Caucasus which can be explained by the existence of regional peculiarities of atmospheric circulation associated with significant influence of the Caucasian ridge. The LAMB may be recommended as an extra tool for synoptic analysis as well as for developing of synoptic climatology and statistical downscaling methods for Armenia and Southern Caucasus.