what is jet stream....
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The mesospheric jet stream is strong and westerly during winter. It reverses to an easterly wind during summer. It occurs about 30 miles (50 kilometers) above the ground in mid-latitudes.
▪▫ The tropical easterly jet stream occurs during summer. It measures some 6,000 miles (9,650 kilometers) long.
▪▫ This jet stream starts in the upper troposphere near Myanmar (Burma).
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Explanation:
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.
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