Question

if Jet streams are westerly streams so why it has been divided into two type Sub tropical easterly jet stream and subtropical westerly jet stream​

Answer 1

Answer:

The Jet Stream Theory is a study of a narrow belt of high altitude westerly winds in the troposphere. It's speed varies from 110 km/h in summer to 184 km/h in winter. This system works as a cover over the Earth which affects the weather of the lower atmosphere. This theory was propunded by the Yest.

It is driven by air pressure, temperature and moisture differences between one place and another. The greater the difference in temperature, the faster the wind velocity inside the jet stream. The path of the stream have a meandering shape which may start, stop, split into two or more parts, combine into one stream, or flow in various directions including opposite to the direction of the remainder of the jet. The main types are the polar jets, the subtropical westerly jets and the less common tropical easterly jets.

Explanation:

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Answer 2

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The Sub-Tropical Jet stream plays a significant role in both hindering the monsoon winds as well as in quick onset of Indian monsoons. During winter season the upper air westerly jet streams are positioned in Asia. These are bifurcated in two branches due to Tibet Himalayan obstruction.