Investigation of Blocking Pattern Role on Precipitation in North East of Iran Using Data Mining Analysis

The importance of atmospheric precipitation in human life turns it into one of the most common subject of various studies. Minimal changes in the amount and intensity of precipitation would face the communities’ social and economic infrastructures to serious problems. Even though these studies have yielded very precious results but in most cases atmospheric precipitation patterns were analyzed not only at a limited regional scales but also only for heavy precipitation (high intensity precipitation). However, synoptic weather patterns, creating precipitation or other atmospheric phenomena, are formed within hemisphere-scale pattern. Among them, blocking pattern is one of the most important large scale circulations. As sometimes blockings embrace a wide range of western Atlantic coast to the Far East. Undoubtedly the identification of these patterns naturally requires a study area much wider than synoptic scope. In addition, understanding of the extreme natural phenomenon like heavy precipitation requires the knowledge of their normal modes. Therefore, this study aims at examination of hemispheric and synoptic circulations along with both heavy (high) and normal (moderate) precipitation (intensities) in Khorasan Razavi and Khorasan Shomali provinces. Investigation of relationship between precipitation amount in Khorasan Razavi and Khorasan Shomali provinces and blocking pattern is the main purpose of this study.