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Jet stream
An area of strong winds that are concentrated in a relatively narrow band in the upper troposphere of the middle latitudes and subtropical regions of the Northern and Southern Hemispheres. Flowing in a semi-continuous band around the globe from west to east, it is caused by the changes in air temperature where the cold polar air moving towards the equator meets the warmer equatorial air moving polarward. It is marked by a concentration of isotherms and strong vertical shear. Various types include the arctic, the low level, the polar, and the subtropical jets.
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- Part of Speech: noun
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- Industry/Domain: Weather
- Category: General weather
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