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Polar Front Jet
The polar front jet is the boundary between the polar and subtropical air masses. It often divides into north and south branches. The polar front jet marks the high speed core of the prevailing westerlies. It is associated with the location and motion of the high and low pressure areas of the middle latitudes. The position, elevation, and wind speed of the polar front jet is variable. The position of the polar front jet tends to migrate south in the Northern Hemisphere's winter and north in the summer. Core winds increase during the winter and become less strong in the summer.
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