Inside the Jet Stream Giving Rise to the Jet Stream
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But now the warm air does not move directly to the north and south. The reason has to do with momentum and how fast a location on or above the Earth moves relative to the Earth's axis.
Your speed relative to the Earth's axis depends on your location. Someone standing on the equator is moving much faster than someone standing on a 45 degree latitude line. Someone standing on a pole is not moving at all (except that he or she would be slowly spinning).
