Where does the tropical easterly jet stream occur?

The tropical easterly jet stream primarily occurs in the Northern Hemisphere at altitudes between 10,000 to 15,000 meters (about 32,800 to 49,200 feet). This jet stream forms in the tropics, particularly over regions like the Indian subcontinent, during the summer months when significant heating occurs.

The presence of this jet stream is closely linked to the climatic phenomena in the tropics, such as the monsoon. The mechanism behind its formation involves the large temperature gradients between the warm air over the land and the cooler air over the oceans. This temperature difference drives the easterly winds at high altitudes.

While there is a counterpart in the Southern Hemisphere, it is different in structure and strength, which means that the easterly jet stream is not as prominently defined and persistent as it is in the Northern Hemisphere. Therefore, stating that it occurs only in the Northern Hemisphere reflects our understanding of its prominent characteristics and climatic influence.