Question
What are Jet Streams?

Answer

(i) These are the air currents which develop in the upper layer of the atmosphere (3 to 5 km above the surface).
(ii) The westerly jet stream prevail over NW and bring winter rainfall while the easterly jet streams steer tropical depression over India.
(iii) These depressions play an important role in the distribution pattern of monsoon rainfall. The highest rainfall occurs along the track of these depressions.

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