tropical easterly jet stream

The tropical easterly jet stream is a meteorological phenomenon characterized by strong, high-speed winds that flow eastward in the upper troposphere, typically above Southeast Asia, India, the Arabian Sea, and tropical Africa. This jet stream plays a significant role in the formation and duration of the Indian and African summer monsoons.1

Unlike jet streams in mid-latitudes, the tropical easterly jet is associated with fair weather and is influenced by temperature gradients that do not extend to the surface, meaning there is no visible surface front. Its presence and strength are closely linked to the heating of landmasses, particularly the Plateau of Tibet, during the summer months. The movement and intensity of this jet stream directly impact the patterns and amount of rainfall brought by monsoonal systems.123