What is the influence of Jet Streams on India's climate?
"Jet stream is a swiftly blowing wind at a height of 3 to 5 kms above
the subtropical high pressure belt. Himalayas act as a barrier in their
path and as such, the jet streams are divided into westerly and easterly
jet steams. the westerly jet is responsible for bringing western
disturbances into north-west India and Pakistan which bring winter
rainfall. the easterly jet blowing over northern India is responsible
for bringing tropical depressions over India and Bangladesh. these
depressions play an important role in the distribution of rainfall."
An easterly jet stream with its axis at a mean height of 14 to 16 Kms is
formed towards the end of June over the Indian Peninsula in the
south-west monsoon season over the latitudes of 10 to 15 degrees
North.The influence of this jet stream on the Indian weather is not
known precisely.However it has been found that this jet stream is strong
when the monsoon is very active. When this jet stream shifts to 19
degrees north latitude, weak monsoon conditions prevail.
Another sub-tropical westerly jet stream is formed along the latitude of
27 degrees North during winter at an average height of 12 Kms.The
velocity of this jet stream decreases as it migrates to north.This
sub-tropical jet adds to the thunder activity in north and north-west
India.
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