Question

what is jest stream.

Answer 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.

Answer 2

Jet stream are fast flowing narrow bands of strong wind in the upper level of the atmosphere. The winds blow from West to East in jet stream but the flow often shifts to North and South. Jet stream follow the boundaries between hot and cold air.
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