The study of heavy precipitation changes in Tabriz county and its synoptic analysis

Rainfall between climate events due to the crucial role it has given special emphasis to the climatic phenomenon of behavioral complexity is high. In the meantime, as a factor in natural disasters such as floods and heavy rains raised. The occurrence of this type precipitation Synoptic patterns associated surface and the upper atmosphere, the synoptic studies are required to better understand the occurrence of precipitation in the region. In order to study-a severe precipitation Tabriz, Statistics precipitation by 1996-2013 from the meteorological station in Ardabil province was prepared, then, for example, several of the region's strongest precipitation hot and cold years and synoptic patterns this precipitation on maps geopotential height, sea level and precipitation per day and 24 hours before its vorticity and omega maps and rainfall water column were identified. Pre-nose Back precipitation severe SMADA data into the software and with normal distribution and Pearson type 3 were evaluated and the possibility of precipitation with Return 2, 3, 5, 10, 25, 50, 100 and 200 was set. But deep down level high-level exposure to 500 HP with moist air loss is the main cause disturbances