The subtropical jetstream is a fast-flowing ribbon of air located high in the 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 the regions below. This jetstream plays a crucial role in the movement of weather systems, often steering storms and affecting precipitation. It can also impact temperature variations, leading to warmer or cooler conditions in areas it passes over, making it an important factor in meteorology and climate studies.