How do jet streams affect Indian monsoon?

What are Jet Streams? * Jet stream, narrow, swift currents or tubes of air found at heights ranging from 7 to 8 mi (11.3–12.9 km) above the surface of the earth. * They are caused by great temperature differences between adjacent air masses. read more

The easterly jet stream steers the tropical depressions into India. These depressions play a critical role in distribution of monsoon rainfall over the Indian subcontinent. read more

Before the monsoon onset, the upper air jet stream is westerly over India but as the monsoon onsets, it changes its direction due to the seasonal migration of an anticyclone (high pressure region with clockwise winds) over Tibet region. read more

Jet streams have distinct peaks (ridges) and troughs. Ridges occur where the warm air mass pushes against the cold air mass. Troughs occur where cold air mass drops into warm air. read more