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What is a jet stream?
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User Christian Rau
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27 votes

Answer:

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 often shifts to the north and south. Jet streams follow the boundaries between hot and cold air.

User Sava
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23 votes

Answer:

It is a narrow variable band of very strong predominantly westerly air currents encircling the globe several miles above the earth.

User Mellville
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