The jet stream shifts position frequently and actually migrates with the seasons. Sometimes two streams flow across the United States, one along the northern border and other well toward the south. The cruising range of aircraft flying downwind within a jet stream is greatly increased. Pilots anticipating high-altitude or long-range flights attempt to discover the location of the stream and use it to their advantage.
For several decades, meteorologists have studied jet streams and how they affect the movements of air masses. While the exact relationship is still unknown, meteorologists agree that jet streams may act as a barrier between cold air in the north and warm air in the south. During their meandering, the streams appear to allow some cold air to flow southward and warm air to flow northward. These flows undoubtedly affect the formation of cold and warm air masses.
Related category ATMOSPHERIC PHENOMENA AND STRUCTURES
Source: U.S. Centennial of Flight Commission
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