The tropical easterly, Somali, Findlater, African easterly jet and polar night jets are temporary or seasonal jet streams. <br /><br />Jet streams are another name for fast-flowing currents of air. <br /><br />The Polar Front and Subtropical jets are the permanent high-level jets streams. <br /><br />They occur in both the Northern and Southern Hemispheres and are part of the larger global circulation. <br /><br />Temporary or seasonal jet streams can be found at various heights in the troposphere and even in the stratosphere.
