Answer:
Jet
streams are fast blowing winds moving in the upper air of the atmosphere.
Sub-tropical Westerly Jet Streams: These jet streams are located approximately
over 27°-30° north latitude; therefore, they are known as sub-tropical westerly
jet streams. Over India, these jet streams blow south of the Himalayas all
through the year except in summer. During winters, the cyclonic disturbances
are brought into India by these jet streams.
(ii) Tropical-easterly Jet Streams: These easterly
jet streams blow over peninsular India, approximately over 14°N, during the
summer months.
It is believed to be responsible for the sudden outbreak
of the south-west monsoon in India.
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