Jet streams are high altitude
westerly wind system blows at a height of 6 to 14 km, with very high speed up
to 450 km/h in wavy form at both hemispheres. As they encircle the poles
Although the jet streams flow at
higher altitude they also influences the surface weather pattern of the Earth.
1. Creation
of Polar vortex: Polar westerly jet stream will carry cold polar air masses towards temperate
region which creates severe cold waves in North America and Eurasia during
winter.
2. Sudden
burst of South west monsoon:
Sudden withdrawal of polar westerly
jet stream from Indian sub continent to northern part of Pamir, leads to sudden
burst of South west monsoon into Indian Sub continent.
3. Late
and early monsoon in South Asia: Rate of with drawl of polar westerly jet stream decides the onset of south west monsoon. Slower and
faster rate of with drawl leads to late and early onset of south west monsoon.
4. Intensity
of monsoon rainfall: The arrival of tropical easterly jet stream influences the intensity of
south west monsoon. This leads to increasing intensity of rainfall during south
west monsoon.
5. Bringing
rainfall to India by western disturbances: Polar westerly jet stream carries rainy clouds from cyclones formed
over Mediterranean Sea during winter towards India. These clouds piles up on
the Himalayas and results in rainfall over the states of Punjab and Haryana.
This assists in the cultivation of wheat in India.
6. Development of super cyclone: The condition at which the speed of the jet stream is transferred to tropical cyclone may leads to development of super cyclone.
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