Tropical Easterly Jet

The Tropical Easterly Jet (jet stream) is the meteorological term referring to an upper level easterly wind that starts in late June and continues until early September. This strong flow of air that develops in the upper atmosphere during the Asian monsoon is centred on 15°N, 50-80°E and extends from South-East Asia to Africa. The strongest development of the jet is at about 15 kilometres (9 mi) above the Earth's surface with wind speeds of up to 40 metres per second (140 km/h; 89 mph; 78 kn) over the Indian Ocean.

The term easterly jets was given by Indian researchers P. Koteshwaram and P.R. Krishnan in 1952.

This jet subsides at somalian coast also known as Mascarene high.

The easterly jet induces significant vertical wind shear during the monsoonal months (especially from July to September) which suppresses any tropical cyclone activity. (Monsoonal depressions generally do not intensify into cyclones)