WHAT ARE JET STREAMS ?
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1.
a narrow variable band of very strong predominantly westerly air currents encircling the globe several miles above the earth. There are typically two or three jet streams in each of the northern and southern hemispheres.
"brief bursts of cold air have been blown into the region by the jet stream"
2.
a flow of exhaust gases from a jet engine.
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net slow he mela (+_+)
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.
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