| Summary: | The study aims to know the effect of the pressure anomaly generated in the North Atlantic Ocean at a latitude of (40) degrees north, which accompanies the East Atlantic-West Russia Index, and to identify its most important effects in increasing or decreasing the number of days of pressure systems’ survival, whether they are in the state of extension or the secondary center affecting the climate. Nineveh Governorate, the city of Mosul, specifically, by analyzing the daily weather maps of the surface level of 1000 millibars for observation (00) and during two 22-year climatic cycles, the first climatic cycle (1961-1950) and the second climatic cycle (2008-2019) and identifying the types of pressure systems and the average number of days The monthly survival of each system , whether the atmospheric highlands such as the Siberian high, the European high, the semi-tropical high, as well as the air depressions of all kinds, the thermal and frontal depressions represented in the seasonal Indian depression, the Mediterranean depression, the Sudanese depression, the integrated depression, the depressions of the West Asian seas, and the Arabian Peninsula depression for the two climatic cycles (1961-1950) (2008-2019) in both cases, whether they remain an extension or a secondary center and the nature of the work of the mentioned systems during the negative and negative phases Positive for the East Atlantic West Russia EAWR index, and what is the statistical relationship between them.
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