Synoptic and Thermodynamic Analysis of Thunder storms in the Plateau of Irann

In the present study, the synoptic and thermodynamic analysis of the thunder storm occurrence in Iran has been addressed. For this purpose, the data related to days with a thunderstorm of 20 synoptic stations in the eastern part of Iran and geopotential heights (hgt), omega and specific moisture content (shum) data were used during the statistical period (2010-2015). After extraction of days with thunderstorms, Arc GIS software and IDW method were used for temporal and spatial distribution maps. Then using GrADS software, synoptic maps were prepared and analyzed in different levels of atmosphere. Also, for the thermodynamic analysis, the Skew-t and CAPE and PWAT indices were used. The results of temporal and spatial distribution showed that from Jiroft city in the province of Kerman to the high latitudes in April and May, the highest frequency of thunder storms is observed and to the lower latitudes from December to February, there is a lot of thunder storms. In the northern part of the study area, the most frequent occurrence is in the spring and in the southern part of the region, the most occurrence occurs in the winter. In total, in all the study areas throughout the year, there is shortly thunderstorm event. The results of the synoptic analysis also showed that during the days with thunderstorms, the negative omega and the ascending and unstable air, and on the other hand, the influence of moisture on the atmosphere of the area and the placement under the cut of low and the front of the Trough, conditions for the occurrence of this Provides a phenomenon. Investigating the skew-t; CAPE and PWAT indices also indicate that there is more humidity in storm day than the day before the storm and the instability resulting from a severe convective rise on the day of thunderstorm.