The polar front is a boundary separating the cold polar air to the north from the warm subtropical air to the south, hence the greatest contrast in air temperature occurs along the frontal zone. Therefore, the polar front has a lot of influence on the development of the polar jet stream.

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Quizplus · Accepted Answer

The polar front is indeed a boundary between cold polar air and warm subtropical air, and this temperature contrast is a major factor in the development and dynamics of the polar jet stream. The jet stream is essentially driven by the temperature difference across the polar front.

The Polar Front Is a Boundary Separating the Cold Polar