Through statistical analysis and determine the date and place of daily rainfall for the study area, which included ten stations from Iraq (2007-2016) It turned out that the behavior of daily rainfall varied significantly from Extreme values reached (89 mm) in Baghdad to min. (0.2mm) in Samawah, Although most of the months of rainy season did not record any rain. Baghdad, Mosul, Khanken and Kirkuk are most variable stations of rain with SD (4). The reason for the change in the amount of daily rain and the difference in distribution between the months of the rainy season is due to the nature of the atmospheric depression where very severe cases it results from the deepening of the atmospheric low surface pressure In this study, it was found that the daily rains of Iraq are not only varying in amount but also a different in Persisting with (1-4and more) days where In March all stations have max. Frequency persisting one day but persisting two days was in January while December persisting three days but persisting four days and more recorded in December. This is due to the nature of the atmospheric depression where very severe cases it results from the Atmospheric depression deepened from the upper atmosphere.
To know the reasons for changing the daily rainfall amount, cases study were chosen for Baghdad station by specifying the maximum and minimum daily rain for the months of the rainy season for each year of the study period (2007-2018). The behavior of daily rainfall for the rainy season varying temporally with maximum (89 mm) and minimum (0.1mm). Synoptic analysis of weather chart for pressure levels (300, 500, 700, 850, and surface) was performed. Visible images of satellites were used to determine the quantities of the cloud for the selected cases. The results showed that synoptic analysis in all cases occurs due to the presence of a jet stream in the upper atmosphere, accompanied by the presence of a basin at the level of 300 hectopascals with an enhancement of relative humidity exceeding 70% at the level of 700 hectopascals, but the presence of the front makes the amount of rain greater in the absence of it. At the level of 850 hectopascals and the surface, the depressions that affect Iraq also differ in their severity and the amount of moisture loaded.
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