Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. The winds blow from west to east in jet streams but the flow.
The jet stream is a relatively narrow band of strong winds in the upper atmosphere. The wind blows from west to east in the form of a jet stream, but the current often shifts north-south. The jet stream follows the boundary between hot and cold air.
The Jet Stream is a horizontal geostrophic wind that blows generally west to east through the upper troposphere at altitudes between 20,000 and 50,000 feet. A jet stream is formed where air masses of different temperatures meet. Therefore, the surface temperature usually determines where the jet stream forms.
The polar jet stream is most commonly found between the 30th and 60th degree lines (close to 60°), while the subtropical jet stream is found near the 30th degree line. These two jets meet at some places and times, but are well separated at other times.
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