The Polar Jet Stream is a fast-flowing river of air located high in the atmosphere, typically around 30,000 feet. It forms at the boundary between cold polar air and warmer air from the mid-latitudes. This jet stream plays a crucial role in influencing weather patterns, as it helps to steer storms and can affect temperatures across different regions. The strength and position of the Polar Jet Stream can vary with the seasons. In winter, it tends to be stronger and can dip further south, bringing colder air to lower latitudes. Conversely, in summer, it weakens and shifts northward, often leading to warmer conditions in many areas.