Figure 23 – origin of the Polar front Jet stream at polar front zone Sub-tropical jet stream

♤ It runs between 250 and 300 latitudes in both the hemispheres.

♤ It blows constantly

♤ Its speed is comparatively lower than polar jet streams

♤ The air currents arising near about the equator descend at 300 N and S latitudes. A part of these air currents takes the form of Sub Tropical Jet streams.

♤ It swings to the north of Himalayas in summer in North India.

Eastern Tropical Jet Stream

♤ It is a seasonal Jet Stream.

♤ It blows between equator and 200N latitude at the time of South-West Monsoon in summer over south-east Asia, India and Africa.

♤ Its direction is opposite to that of other two jet streams. It runs in eastern direction.

♤ It is located comparatively at higher height between 14km and 16km

♤ Its speed is around 180 km per hour.