The jet stream is considered one of the basic engines of the synoptic systems in the atmosphere and has a major impact on different regions of the world. Therefore, this study addresses the movement of the polar jet stream and the subtropical jet stream and the extent of interaction between them, as well as the extent of their impact on the 300 hPa layer over Iraq in terms of some variables such as pressure and temperature. The study was based on data taken from the University of Wyoming data center in the United States for the period from January 26, 2024 to February 9, 2024. This period witnessed active polar and subtropical jet streams. The study reached that the subtropical jet stream has a faster impact on the 300 hPa layer over Iraq compared to the polar jet stream, and there is a consistency in the change in pressure and temperature values between the polar and subtropical jet stream to a large extent, as it can be said that the pressure and temperature values increase and decrease at the same period, but with no very large time difference over the duration of the study. Also the study mentioned that both of polar and sub-tropical jet streams influence on Baghdad city in the layer of study (300hPa) in winter but the subtropical jet stream has more correlation than polar jet in this season.

The jet stream is considered one of the basic engines of the synoptic systems in the atmosphere and has a major impact on different regions of the world. Therefore, this study addresses the movement of the polar jet stream and the subtropical jet stream and the extent of interaction between them, as well as the extent of their impact on the 300 hPa layer over Iraq in terms of some variables such as pressure and temperature. The study was based on data taken from the University of Wyoming data center in the United States for the period from January 26, 2024 to February 9, 2024. This period witnessed active polar and subtropical jet streams. The study reached that the subtropical jet stream has a faster impact on the 300 hPa layer over Iraq compared to the polar jet stream, and there is a consistency in the change in pressure and temperature values between the polar and subtropical jet stream to a large extent, as it can be said that the pressure and temperature values increase and decrease at the same period, but with no very large time difference over the duration of the study. Also the study mentioned that both of polar and sub-tropical jet streams influence on Baghdad city in the layer of study (300hPa) in winter but the subtropical jet stream has more correlation than polar jet in this season.