Jet Stream view explains the pattern of development of periodical storm in troposphere. A westerly fast air current flows over the Western and Central Asia north of the Himalayas, with steady velocity. It flows over the narrow zone of the upper atmosphere and is called Jet Stream. The Tibetan highlands act as a barrier for the Westerly Jet Streams and it gets bifurcated. On the basis of the area the Jet Streams are known as Tropical Eastern Jet and Semi-Tropical Western Jet. Low pressure region over land and the Eastern Jet stream steer in the tropical depressions into India. These depressions help in distributing the monsoon rainfall over the entire India.
