The relationship between geopotential height 500hpa circulation patterns with weather types of mountainous region of Iran

This paper attempts to investigate the relationship between 500hpa circulation patterns and weather types (coldest, warmest andraining)over 16 synoptic stations of mountainous region of Iran. The mountainous region of Iran covers about 670000 square kilometer (41 percent) of Iran. In this paper have been investigated the relationship between circulation patterns in 500hpa level with weather types of the mountainous region of Iran using Matlab software. Therefore have been used Asfazari catalogue classification of circulation patterns.Research indicated that circulation patterns No. 14, 17, 13 and 15 have the strongest relationship with warm weather types and circulation patterns No. 2, 16 and 1 have the strongest relationship with cold and raining weather types over mountainous region of Iran. These research findings have main role to predict warm periods and estimate cold and raining periods in mountainous regions. In general weather types of mountainous region of Iran are related with more than one circulation pattern.