Jet streams are narrow bands of ____ that blow from ____ to ____ across the globe. Jet streams form when warm air masses meet cold air masses in the ____. When Earth’s warmer air masses meet cooler air masses, the warmer air ____ in the atmosphere while cooler air ____ to replace the warm air. This movement creates ____. A ____ is an air current that forms ____ in the atmosphere. On average, jet streams move ____. Temperature differences between the warm and cool air masses cause jet streams to move at higher speeds — 250 miles per hour or faster. Speeds this high happen in polar jet streams in the winter. The jet stream that moves over the United States ____ the ____ air in the north from the ____ air in the south. In the summer, this jet stream is further ____. More of the United States is warm when the jet stream is further north. In the ____, the Jet Stream moves south. The further ____ the jet stream goes, the further south cold weather will reach.

Jet Streams

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