What are the fast-flowing, narrow air currents located between the troposphere and stratosphere called?

Jet streams are fast-flowing, narrow air currents found in the atmosphere, primarily located between the troposphere and stratosphere. These currents are significant because they influence weather patterns and can affect air travel. The existence of jet streams stems from the temperature differences between the equator and the poles, which creates a variation in air pressure.

Jet streams typically flow from west to east and can be found at altitudes of around 30,000 to 39,000 feet. They are strongest in the winter months and can vary in strength and position, which is why they can have a notable impact on weather systems, including storm paths and patterns. Understanding jet streams is essential for meteorologists in predicting weather changes and for pilots in planning flight routes to optimize fuel efficiency and time.