The Subtropical Jet Stream is a fast-flowing ribbon of air located in the upper atmosphere, typically found between 20 and 30 degrees latitude in both the Northern and Southern Hemispheres. It forms at the boundary between warm tropical air and cooler polar air, influencing weather patterns and climate in various regions. This jet stream plays a crucial role in the movement of weather systems, often steering storms and affecting precipitation. It can also impact the development of high and low-pressure systems, making it an important factor in meteorology and climate studies, particularly in relation to phenomena like El Niño and La Niña.