---
title: "Tropical Easterly Jet: UPSC Geography | Model Diplomat"
description: "The Tropical Easterly Jet is a summer upper-air easterly wind over Asia and Africa that drives the Indian monsoon. Key UPSC GS1 climatology concept explained."
url: "https://modeldiplomat.com/learn/glossary/tropical-easterly-jet"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- The Tropical Easterly Jet is a high-altitude easterly wind current in the upper troposphere over South Asia and Africa that strengthens the Indian summer monsoon.
- How does the Tropical Easterly Jet differ from the subtropical westerly jet stream?
- Why does the Tropical Easterly Jet strengthen the Indian monsoon?
- What role does the Tibetan Plateau play in forming the jet?
- Why is the jet associated with aridity over Africa while bringing rain to India?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

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In June 2009, a weak and erratic Tropical Easterly Jet accompanied India's deficient monsoon that year, when the India Meteorological Department recorded one of the driest seasons in decades, severely affecting kharif crops.

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